Looking for the last piece to the puzzle !

Savage Model 29 ( or retail seller for the " Ranger " )

A small steel ball called: Cartridge Cut-off product 990060A

It is located in a cup, in right side of receiver, covered by the right slide frame arm. its a detent ball for slide movement

All I need is a measurment . . . . via micrometer . . . . how big/small it it ?

Or Do you know where one might be found ?

Thanks !

Be safe out there !