MANDREL FOR MACHINING OLD RETAINERS
I had a different combination of valve stem and spring diameters to work with and I could not find spring retainers to fit. I had previously made these mandrels to hold and modify 7° & 10° retainers, so this job was easy to complete. With another simple Mandrel “O.D.ing” valve seats is easy as well. Keep the old parts and use or modify them for the next job.

Randy Torvinen
Torvinen’s Machine
Menahga, MN
March, 2020