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 Post subject: How to unshrink a tensor
PostPosted: 18 Jul 2020, 19:55 
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I have two Donic Bluefire M1 Turbo rubbers, which were cut to fit my blade. For reasons, I removed them, and stored them carefully, however after retrieving them I see they have now shrunk by several milimetres, and don't fit the blade at all.

Is there a recommended way to unshrink them, so I can reattach them again?

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PostPosted: 18 Jul 2020, 20:47 
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Only a booster will fix that. Possible some oil might be enough to get it to fit.

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PostPosted: 18 Jul 2020, 22:23 
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Just opt for micropore sponges. DHS Hurricane series would never shrink in size.


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PostPosted: 19 Jul 2020, 00:01 
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I agree, Igor. I've never experienced this with Chinese rubbers.

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PostPosted: 19 Jul 2020, 03:52 
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They'll never be quite the same, but try a very few drops of baby oil. The difficulty will be to spread it thinly enough, especially as I don't know the structure of the sponge. Otherwise, Falco Long can be used, and is thick enough that you can spread with with the supplied brush. I used this a couple of times on some shrunken Xiom rubbers, and it worked, but the rubber is not the same.

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PostPosted: 19 Jul 2020, 04:11 
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Yeah. You have to use a combination of how much BabyOil and ParaffinOil ... and if you want the "boost" restored ... then mix inside an empty Falco brush bottle. DONT shake it but rather Stir it gently until you are almost sure it is well mixed WITHOUT bubbles ( do not form emuision instead you want a blend or solution ) . Else the sub-optimal way is to apply each in "layers" ... apply one... let it dry ... test the rubber ... apply next layer ... dry it ... test again ... until you have the right size ... and right squishiness ,,, right springiness .... right tensioned or untensioned ...

BabyOil and ParaffinOil seem to have a softness effect without too much boost. Problem dont overdo it or it becomes squishy and mushy.

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PostPosted: 21 Jul 2020, 01:36 
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man_iii wrote:
Yeah. Problem dont overdo it or it becomes squishy and mushy.



That is the problem I ran into with Bluefire M2, I never could put the magic back into the rubber. Softer and mushy everytime. Didn't matter what I used or how much. Wish I knew the solution, it would have saved me a lot of wasted time searching. :headbang:

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PostPosted: 21 Jul 2020, 02:46 
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You know, there was a time when we didn't care that the rubber didn't fit your blade. You'd run into people at a tournament, they'd have rubber that was obviously moved from another blade of different shape, for instance. Maybe their cousin gave it to them. It didn't matter in the least if you could see a little wood, people just didn't care. Why do people actually care so much about it these days? Do umpires go patrolling around leagues, these days, peeking at peoples' bats, ejecting them from games if a little sponge is showing because you hit the edge of the table with your bat last weekend? This is the behavior of an Igor, not a normal umpire.

There's the other issue, of course, that shrunk rubber feels dead, but that's another issue.

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PostPosted: 21 Jul 2020, 06:00 
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Falco long worked on a shrunken Barracuda,3 or 4 layers and it went bigger than its original size before it shrank!

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PostPosted: 21 Jul 2020, 13:57 
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That's what boosters do, of course... make rubber expand. And why Tensoroids shrink - the factory boosting wears off.

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PostPosted: 21 Jul 2020, 17:50 
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A simple solution that I have found works quite well is to warm the rubber against the side of a just boiled plastic kettle after applying the glue. It more or less expands back to original size and restores some of the original tension.


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PostPosted: 27 Jul 2020, 00:14 
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That's a handy trick - I might try that!

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PostPosted: 29 Jul 2020, 02:27 
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PLASTIC kettle, he said, mind you... the first time I read that I missed the "plastic" part. I wonder what a regular "Polly put the kettle on" steel kettle would do to rubber when it's just boiled.. :lol:

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PostPosted: 03 Sep 2020, 12:00 
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Any progress here? I replaced some rubbers on a mates blade and was going to put his old ones on a giveaway blade, but as said above, there is the tensor shrinkage problem.

I've put 3 layers of baby oil on the sponge which has just made a sticky mess. I've glued to blade and was still 2mm short, so now taken off and am slowly removing the sticky gunk from the rubber. Currently it has reverse dome in the sponge is larger than the rubber surface. I'm now looking to expand the rubber surface slightly.

People say wait a few days but in my experience, this doming never corrects itself with time.

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PostPosted: 04 Sep 2020, 00:43 
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Cobalt wrote:
Any progress here? I replaced some rubbers on a mates blade and was going to put his old ones on a giveaway blade, but as said above, there is the tensor shrinkage problem.

I've put 3 layers of baby oil on the sponge which has just made a sticky mess. I've glued to blade and was still 2mm short, so now taken off and am slowly removing the sticky gunk from the rubber. Currently it has reverse dome in the sponge is larger than the rubber surface. I'm now looking to expand the rubber surface slightly.

People say wait a few days but in my experience, this doming never corrects itself with time.


Don't worry about the curl. If you have actual booster already, put a couple of layers. If still too small, roll/stretch with some pressure.

If you want to be technical:

1. Use a good amount of glue (DHS 15 works great).
2. Start by stretching from handle to end of blade surface, but only adhere the central line area.
3. Then roll towards each edge, starting from the center.

Flat end of a rubber protection sheet between the rubber and blade works great when starting. You stretch one half and keep the other one from sticking.


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