TS 2412 Elevation Handwheel
There should be a lock washer between the head of the screw and the where it seats into the crank. If there is not, look at the parts page of your manual and obtain the correct lock washer and install it. This would be first cause.
Second cause would be the insertion of the wrong screw. Either by mistake, or supplied, of the wrong length. If it's too long, it will bottom out in the whole before tightening on the crank wheel.
Either of these fixes should correct your frustrations.
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