If your OP-1 won’t turn on or turns off randomly try this, worked for me.
https://www.instagram.com/p/CA5lLl1hUxO/?igshid=wht8xbpi8hc1
your link appears to be busted?
@docshermsticks should be ok now.
So basically the switch can be opened and cleaned, the contacts can be opened very carefully to make better contact, see the pictures on the post.
It works as good as new now.
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nice one!