Just succeeded in convexing my bk15!!
Ive tried before, its just never turned out quite right.
Thats what I used...home made 2 sided strop, and my home made convexing block. Its just a 2x4 block with a sheet of thin neoprene wet suit material stapled over it. I just stapled wet dry automotive sandpaper directly over the neoprene. I used a grit progression of 400 (for the reprofiling/convex grinding of the shoulder), 800, 1500, black compound on leather, then finished with green compound on leather. Pics of my results below...
Ive tried before, its just never turned out quite right.

Thats what I used...home made 2 sided strop, and my home made convexing block. Its just a 2x4 block with a sheet of thin neoprene wet suit material stapled over it. I just stapled wet dry automotive sandpaper directly over the neoprene. I used a grit progression of 400 (for the reprofiling/convex grinding of the shoulder), 800, 1500, black compound on leather, then finished with green compound on leather. Pics of my results below...