I trim my GMA blocks with a band saw which was purchased at the hardware
store.  The blades do not create the fine dust as you described.  Fingers
are kept in tact by using a block of MMA (wood works as well) to push the
GMA through.  I embed in peel-a-way molds and clamp right onto the block,
so I trim my blocks on the band saw into what looks like a "T".  This saves
time and my tungsten carbide knives.

Koch is the name of the butcher supply house I believe Gayle was talking
about.  I buy  my nitrile gloves from them because they are less expensive
than the lab warehouses are.

Hope this helps.
Cathy



 
***************************************
GLP Compliant Laboratory 

Cathy A. Mayton
Project Director
Wasatch Histo Consultants, Inc.
80 Youngberg Road
Winnemucca, NV   89445-5709
Voice:  (775) 625-4425
Fax: (775) 625-1548
www.wasatchhisto.com
***************************************