I think i know that a uncovered Trembucker and the PATB can be mounted with a standard ring, only a covered Trembucker needs a Trembucker ring. Am i right?
Long ago i had a PATB-3 and i think i used a standard ring. But i am not sure!
Now i put out a caliper und looked at the Dimension tables. It looks like there are different ‚standard‘ rings on the market, so some may fit and some not.
