Platen adjustment on a KMG belt grinder?

Ordered a ceramic platen liner yesterday. My current metal one is nine inch and the new liner is eight. I plan to mill the metal one flat and clean it up some. I'll leave a small ledge on the bottom that the glass platen can rest on. Should probably still use some screws though.

A ledge will perform the same function as screws - its just a ledge to prevent the liner from dropping down and getting caught between the belt and lower wheel if the epoxy lets go. Having had my liner pop loose after a belt snapped, I can only surmise the belt impacted the liner and knocked it loose. It was after over 10 years of use before that thing let go - not too bad.
 
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