I'm surprised to hear about Mr. Ye working on an M6.
He did tell me that he only works on meterless m bodies.
The first time I used him I sent him a couple of emails asking questions about prices to CLA my M2, IIc, 3 lenses, etc etc, and he finally responded by telling me to put it all in a big box, ship it to him and he would take care of it.
I did and they were like new- and smelled new- when they returned two weeks later.
I agree with sending him a blank signed check- he's the man.