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That's funny... I have been asked similar questions here, before... and no, I don't feel any special...:-) Easiest, shortest possible answer: ... School of "Life"! (That's the hardest training I ever went through, and still not quite done with it...;)) My formula: Keep eyes and ears open...

Correct; just pry up a tiny bit at a time and do several passages. Otherwise the metal is expanded too much and will crack. It is not necessary to do 360°; about 3/4 of the circumference and it may come apart already. Yes, you need to do this with a small shop press and at least two molds (=...

To evenly press it back to original shape I use exact fitting bearing cups, eventually turned/chamfered accordingly. Will try to find what size/ part# it was for the speedo.... Sometimes YES, see above...:smile: G.

Agreed Bjorn, but not as difficult to do as one would suppose. Actually it takes more patience to start - carefully pry up - open the rim evenly to avoid cracking; not even 360º all around, just enough for the parts to come apart. The ring holding lens and gasket to the body is made of soft...

No..only for the last 15years... :-) Gracias amigo! ... todo por nuestro querido MV-hobby! G.

;-) The original Q. was IF they can be opened W/O destruction.... Now to answer your Q.: ......NOT worth it if those replacements were NOS but - YES, if we are considering the cheap chinchulin-repros that are being offered as aftermarket! I bet that a restored 50-year old SW tachometer will...

Yes, they can be opened, lens polished and most can be restored to like-new condition! ... with some practice and if you have the time, a small press and if you can fab the molds(dies) to safely hold & crimp the parts back together. Keep in mind, these gauges all come completely sealed against...