sansui tu-999

I was wondering if anyone has any dealings with a stuck, or binding tuning dial on a Sansui TU999? It seems to tune in the station correct by the numbers on the dial, but then gets a bit tighter and makes a noticeable ‘clunk’ before continuing on down, or up the dial. It doesn’t seem to slip, so...

From an estate sale. I wish I could say that I got it for $15 but it was $95. OUCH! Works just like a new Sansui! Anyway, it does not have the rubber feet. I found a store on Amazon that has rubber feet for your every dream. SO, my question is, does anybody know the actual SIZE of the original...