I know you make your own tools. Seems like anyone who uses tools much soon hits a case where cutting a piece of PVC for a seal driver is easier than buying a "real" one. I'm tired of taking heads to use someone else's valve spring compressor. I made mine oversize because I'm sure I'll use it as a clamp eventually. Instead of shopping and waiting for acme thread, I just used threaded rod. The rest is 1/2" square tubing and 3/8" square rod -- they slip fit great and hold themselves aligned for brazing. A better handle and valve pad will come somewhere down the line. So toss in your homemade motorcycle tools.