I roughed two small kerfs onto the spacer as well to give me that much more line-em-up to aid insertion. Also keeping the piece in the freezer while youre doing the swap really helps get it back in. That actually makes it too easy, sometimes, so I make sure to forget whether I needed one or two washers to make it actuate properly until after I've put it in.
Also those switches live a hard life suspended upside down in hot oil and occasionally zapped with electricity
I'm not surprised they weep.