[ithacaartist]

I've done it on both the 1900/'06 style frame, as well as a 70's Mauser--which has the same grip safety as the Swiss, since 1929, I think, after Bern began using its own tooling.

I first raised the tail of the lever just enough to disengage the pivot and slide that end over into a portion of the frame that was cut out. The safety lever is hardened, to be stiff. This makes it potentially brittle--but it will spring a little/just enough to install or remove and still maintain its shape. Then the upper part of the lever/bar will slide out from its channel in the frame. When reassembling, don't forget to engage the new spring with its doohickey on the back side of the lever when reversing the process. Sorry if my description isn't very vivid or detailed. I winged it, and it was pretty easy.