I did the sinker experiment back in high school. I didn't have any money, but I had a can full of old lead printer's type and some scrap 2x4's. I took the 2x4 and drilled 3 rows of holes partway through of different diameters. Then I made 3 slices with a band saw through the center of each row of holes. I clamped the board back together, and melted the lead, took off the slag (lots of it) and poured it into the holes in the board. After it cooled, I took off the clamps, got the lead cylinders out and then drilled the centers out with a drill press. Cheap sinkers. Plus it kept a high school kid out of trouble for a couple of hours.
I've tried the knife making out also. It made a decent blade, but I lost it and all the guns when I was burglarized 10 years ago or so. I've been meaning to try it again.