Nollster,
You can put some white tape on the back of your thumb hole, then put in the "magic Carpet" on top of them.
If you find the adhesive is not that great on the "MC", you can buy a roll of "3M General Purpose Carpet tape" to fix it. P/N of 3M tape is 714NA.
This 3M tape does not leave sticky suff on removal and very strong.
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baiki
"Faulty mechanics makes all balls bad." Bill Hall, BTM Dec. '98