[ATM] Pitch Source / Edge-stacked Tile Tool

[IAPDK@ADMIN.DRAKE.EDU]

Where can I get three pounds of pitch?

I'm just about finished hogging my three 14" plate mirrors and want to
use new pitch on these, plus I don't have enough left from my 8"
projects.

If you haven't seen a "spiral-wound, edge-stacked" tile tool,
it is a marvel to behold.  I want to grind the three mirrors in
parallel and expected to grind through several layers of tiles in
the process.  Taking an idea from the Mirror-o-Matic group,  I turned
two-inch tiles (about three 12x12" sheets) into one-inch ones with 
a tile cutter, taped them into strips of 10 and coiled them on edge to 
fill a 10" form.   I mixed enough plaster to cover them about 1/2 inch 
and jiggled and poked that down into the cracks.  Then mixed and added
another inch of plaster.  After an hour I removed it from the form,
flipped it over and filled in the cracks with a little more plaster.
It's a nice tile-dense tool that hopefully will fine grind all
three mirrors.  

Dental plaster goes for over $30 for 25lb around here from dental
supply places.  But I found a lumber supply place that sells 100lb
for the same price.  Doesn't hurt to call around.

Paul K
http://www.pbase.com/paulkline/telescope_making