Hi everyone,

I have what is apparently Corbin's first attempt at a removable core, which according to the CorbinRusswin manual is referred to as "Round Removable Core" , dating from 1964 to 1971. When viewed from the front, it looks no different from any other Corbin/Russwin rim cylinder. It consists of a full size cylinder housed in a thin outer shell which carries the tailpiece and mounting points.

My question pertains to the control key--I can see from the diagram that the last pin is the only one which operates a control sleeve, but which way does it turn to remove? It looks like it should turn to the left, but most cores it should be to the right?

Thanks