sorry for the tardiness, but...
Here's the supplies & equipment needed: linen cloth; scissors, ruler, potassium nitrate, tea kettle or pot, Pyrex measuring cup, Pyrex casserole dish, wooden dowl (1/2"), carpenter's glue.
1) Find a good fabric store and buy a yard of 100% linen (no plastic or man made fibre added);
2) Find a pharmacist or chemical supply house and buy yourself a pound of potassium nitrate. You may have to explain that you're not the kitchen terrorist about to take on the world.
3) Boil water in kettle and when boiled, measure out 1/2 cup of water. Add about 10 teaspoons of Potassium nitrate and stire. Add a few more teaspoons and stir. Watch for the water to reach saturation point (liquid won't accept any more Potassium nitrate) which will show when a small swirl of Potassium nitrate will swirl around in the bottom.
4) Roll up the strips of linen and shove it into the measuring cup. Pull it out, reverse roll and stuff into cup again. You want to achieve even saturation of the linen.
5) Lay strips out in pyrex casserole dish. Drain liquid off & back into measuring cup. Let the strips dry (they'll have a sparkling frosted look when dried).
6) The unused liquid can be allowed to dry and the crystals collected and used again.
7) Cut dry strips to about 1 5/8". Roll strip around dowel. Cut off so there is an overlapping seam about 3/16 to 1/8". Unroll, slightly, and using carpenter's glue along the overlap, apply glue to overlap.
8) Slide linen tube down to the end of the dowel. Fold edges of tube into the center, saturate with glue, mash fiber together until saturated. Slide the fabric catridge shell off and let the glue dry overnite.
9) The next day, bell out themout of the cartridge, and slide the ase of a slug. Figure out how much you'll need to trim down...the linen should just protrude from the breech (almost a flat end should be cut off) to be sheared off, and enough fabric should be left to get up into the bottom of the grease groove.
10) Remove cartridge shell from slug. Pour into cartridge shell 60gr of FFg powder. Squeeze a bead of carpenter's glue into the bottom of the grease grove and slide slug into fabric until even with the bottom groove. Mash into place, saturating the fabric. Set aside to dry.
(These instructions were originally provided by Larry S. of Nevada - my Whitworth mentor).