The GS-4 uses
Boxpoc drivers. At the time, the only source I could find was from
"Little Engines". These drivers were very well made but were not
exactly like the GS-4. Oh well! This was my first attempt at machining
cast iron. I burnt quite a few brain cells trying to figure out
where/how to start machining them. I looked at several articles and
decided it's time to bite the bullet. The centers were drilled, bored
and then reamed. I then mounted them in the lathe and began cutting.
I did the backside
first, then turned them around and did the front. I saved the tire and
flanges for last. I must be lucky because everything turned out fine.
I also had to make "custom" cutters for my lathe to get the proper
profile (another learning experience). After completing all 8 of them,
it was time to look at my work and be amazed I didn't screw up.