On Wednesday, May 24, 2017 at 8:32:35 AM UTC-7, Boris Mohar wrote:
Greetings!

My MX500 handpiece went open in the handle. Does anybody know how to take it
apart?

--
Boris

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You don't. You bite the bullet and buy a new one. There's a new one on eBay for $77 or you can go to Mouser for $104.25.

I use my Metcal quite a bit and am still on the same handpiece for 15 years but I do have a shiny new handpiece "just in case". Also, my Metcal was bought used on eBay.

G²