Leak test tool for Olympus scopes without control knobs 140/190 and 260/290 series

This practical tool was designed to find possible leaks in the ERCP / US scopes at the elevator lever.  Just remove both control knobs and after installing this tool you have a perfect view of any leaks in this area.
Of course it will also work on all other scope models of the 140-190 and 260-290 series.