Cav,
I made this scratch stock from two pieces of 1/4 inch thick plexiglass. One side is tapped for the 1/4-20 bolts and the other side has clearance holes for the bolts. The cutting blades can be ground from 3/32 inch tool steel or even an old power hack saw blade. The blade can be clamped between the two plexiglass side plates at various angles to change the profile some, even with a given blade. It takes a bit of practice to use this tool without messing up the stock, but I have done several stocks successfully with it.
The following is a copy of some related information I posted a while back.....it may be of use to you......
Anyway, a while back, one of the members here (sorry I can't remember who) posted a link to a British fellow who had a woodworking tip on how to make a quick, inexpensive "beading tool". I clicked on these two links:
Now I have made and tried a great variety of tools to aid in getting nice straight beads / moldings along ram rod channels etc. Some photos:
Scratch stock :
Home made molding plane:
A beading scraper that rides a brass rod placed in the ram rod channel:
Individual form scrapers:
And I have used Acer's method of drawing a nice straight pencil line, following that with a veiner, and then straightening with a file, etc. They all work and all have their utility but all of them rely on getting the first line nice and straight. So when I saw the above links I thought, wow, that might be an easy way to get that first straight groove in place easily. So I made this very complicated tool:
And then ran it up and down the ram rod channel lips on the little rifle.....like this.....
I used it first as a marking gage with just the smooth edge of the screw indenting a line in the maple. Then I turned it so that the screw slot actually cut wood. I have to tell you, that was the quickest, easiest, most sure fire way I have put a very straight groove in the forstock without fighting the grain or the natural wobble of the other tools / methods I tried. Just thought I would report in on this while I re-start work on the little rifle.