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Rebar Rubber thimbles

Rubber thimbles 

Swingline Rubber Finger Tips.  About $4 for a box of 12.  Buy the smallest size (which is size 11).  By shopping around you may be able to get them cheaper.

http://www.amazon.com/Swingline-Rubber-Finger-12-Pack-S7054031C/dp/B00007LB0F/ref=sr_1_8?ie=UTF8&qid=1311020627&sr=8-8