I've never used Don Collins but his reputation is very good. He used to make them from the old Westinghouse micarta but the supply ran out. I contacted him a year or so ago about using the new stuff from Sheffield and he hadn't heard of it. I never spoke to him again but you might want to shoot him an email and inquire about it.
http://www.collinscraftgrips.com/smi...ps+%28S%26W%29
Here's a shot of the antique paper micarta from Sheffield: