I still have the package in the shop so I'll have a look tomorrow. I don't remember what happened to the original steel insert, whether it broke or I got tired of it wearing out blades
The original would have been aluminum. I used my lathe to make a replacement out of holly. Had to make it much thicker except for the rim. It's been fine.
Actually I'm pretty sure it was steel
I found the package the inserts came in
