Can only guess how the 2 gib screws are situated on your machine as I'm not familiar with the PM935 mill.
The Bridgeport uses a single lock which has a taper that bears against the knee gib when the front handle is rotated up.
"Tming" 2 screws to advance evenly is not going to be easy. Using indexable (or adjustable) handles with external threads to match what's on your mill might get the job done if they are linked in such a way so that they tighten up evenly. The linkage(s) would have to have an "evener" (think of a single horse evener , but in reverse) to allow some leeway between the handle positions. A lever with an eccentric or screw/nut assembly could then be attached to pull the center of the evener to employ the locks.
Check out some indexable/adjustable handles on McMaster-Carr or on Amazon, to name a few sources.
gatz
The Bridgeport uses a single lock which has a taper that bears against the knee gib when the front handle is rotated up.
"Tming" 2 screws to advance evenly is not going to be easy. Using indexable (or adjustable) handles with external threads to match what's on your mill might get the job done if they are linked in such a way so that they tighten up evenly. The linkage(s) would have to have an "evener" (think of a single horse evener , but in reverse) to allow some leeway between the handle positions. A lever with an eccentric or screw/nut assembly could then be attached to pull the center of the evener to employ the locks.
Check out some indexable/adjustable handles on McMaster-Carr or on Amazon, to name a few sources.
gatz
