Vintage DD turntables. Are we living dangerously?


I have just acquired a 32 year old JVC/Victor TT-101 DD turntable after having its lesser brother, the TT-81 for the last year.
TT-101
This is one of the great DD designs made at a time when the giant Japanese electronics companies like Technics, Denon, JVC/Victor and Pioneer could pour millions of dollars into 'flagship' models to 'enhance' their lower range models which often sold in the millions.
Because of their complexity however.......if they malfunction.....parts are 'unobtanium'....and they often cannot be repaired.
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Well, I foolishly purchased a broken Dual 701 off of eBay Friday. I'll put it in the stack of projects to modify. That is, if I can get it working?
For those of us who are not Dual cognoscenti, what is a Dual 701?  I guess we should assume it's DD.  Dual pioneered the coreless motor.  In fact, most coreless TT motors in use even up to today (Brinkmann) are naught but developments on the Dual motor.  Does the 701 contain such a coreless motor?
According to Vinyl Engine the Dual 701 is one of the rarer and nicest Dual decks out there.
Uses a " low torque direct drive motor"

Appears to have an enthusiastic following.
Good evening group.
i just inherited a JVC QL-10 with Lustre GST-801 from my uncle who passed away.
He bought it brand new in lates 70s.
I would say it hasn’t been turned on in the last 15 years.
i brought it home, cleaned it up and tried it.
it locked on 33.33 for about 5 minutes and then it sped all the way up to about 67.34 rpm.
33 and 45 run at that speed and then I can see it slows down and goes back up.
I opened it up and out of my league.
i can do some things, but this one looks scary.
is there a place where I can send it?
How much could I be looking at to have it fixed?
Thank you!