At least on the ones i have worked on, on the ramp there are two screws that are soldered on to the barrel (head down) so that the threads stick up - if you look on the ramp you should be able to find two round nuts with a key way cut across them (you might need to file a slot in the middle of the blade of an old flat head screw driver to make it fit). Actually it might only be one screw on the front ramp and two on the back (sorry can't remember). Undo these and then file/cut off the screw stubs that will stick up. Will be permanent; but ends up pretty tidy.
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