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Removing seized small grub screws
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75Plus:
You might try a short, straight, bit of 2.5mm hex key as a punch to loosen the screw. With the collar resting on a solid surface give the punch a couple or hard taps with a hammer. This should cause the screw to loosen enough to be removed.

This method has worked for me many times when dealing with sheaves and sprockets.

Joe
Jonny:
I have a more robust type vice but the handle end is exactly the same style with the threaded collar.
One grub screw in my collar think its M10 or M8 off hand with a flat on to the thread. The collar is for adjusting backlash and jaw movement, set it right and it will seize at an inapropriate time, needs a bearing.

The grub screws not the hardest and could do with replacing, so give it some.
IF it rounds off, drill them out. Worst case could drill and tap next M size up.
wildman692:
try soaking in vinegar for a couple of days, being a mild acid it will eat ant rust making removal easy, remember to flush well afterwards.
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