Someone that can recap/refurbish/recalibrate a direct drive turntable motor?

Fidelis Analog is the only game in town. If JP ( the proprietor) will agree to work on the TT81, go for it. There is no second best.

By the way, the problem most likely resides in the servo mechanism, not in the motor. 

I'm UK based, their is a Member of the Forum Lenco Heaven and DIY Audio who's user name is 'BillWojo'. I believe he is residing in the US and is very well versed on TT's from this Brand and a selection of other Vintage Japanese TT's.

I would also include somebody who is not a business in any inquiries to be made, it is not strange for a proprietor of a Commercial entity to not have made discoveries they charge for as a result of enthusiasts publicly sharing information.

Most Bearing modifications and replacements that are offered be a Commercial entity are only available as a result of what has been learnt from investigating forums where DIY enthusiasts are offering up information about their undertaking the servicing or additional engineering required to improve / modify these. mechanical devices. 

The TT 81 is a TT that is very worthy as a donor to undergo a modifications.  

Pindac, as I understand it, the OP has a TT81 with speed issues. He needs someone who is expert with the servo mechanisms of vintage Japanese DD turntables. In the USA, that person is JP Jones at Fidelis Analog. He doesn’t necessarily need a new bearing or even Panzerholz.

Interesting Thread Policing going on.

"I'm interested in anything that can improve my motor. Is your friend currently taking new business?"

There are others on DIY Audio and other forums who have fully overhauled this  TT model and other Japanese Vintage TT's. These individuals are very open with what they did and have assisted others successfully with Trouble Shooting operational issues, these individuals are easy to find and do seemingly reside in the US.

My suggestion is a viable option to consider for the OP, as investigation could discover a local support might be on offer. Who knows? A good friendship might be very close to taking root. There is zero harm being done if a few more of these are able to be cultivated. 

I feel very confident the OP would very much enjoy learning of Panzerholz in use as Plinth Material. Especially as material that has been selected by quite a growing number of TT users, where the P'holz has superseded the use of the earliest  designs for a Plinth. I am sure the OP would like to know about cases where the use of P'holz has been very convincing, encouraging other materials such as Stones, Resins and Metals to be superseded in use.

I'm more than satisfied with my discovery of the different producers of the material known as a 'Phenolic Resin Impregnated Densified Wood', of which Panzerholz is a Brand name for it.  

 I'm more than satisfied with my being an advocate for the use of Densified Wood, enabling others to learn more if wanted. 

If you can select quotes, I can select quotes, too:

"My daily driver is a JVC TT-81 in the dual tonearm JVC plinth, but lately it’s been pretty flaky, e.g. noticeable flutter, along with an occasional speed runaway and strobe not reporting correctly even though the speed is clearly close."

This is indicative of a servo problem. All the bearings and all the Panzerholz in the world is not going to fix the problem described in the OP. That’s all I am saying. I know your suggestions are well meaning. If armstrod lives in the UK or on the continent, perhaps you know of someone with the skillset to investigate the servo of a JVC turntable. That particular mechanism is very complex. I bought a malfunctioning TT101, which might be even more complex than a TT81. I spent two years and sent it out to 2-3 gurus over that time with no success. Then I found JP Jones through internet revelations regarding his work on Technics SP10 TTs. JP found and fixed the very esoteric problem with my TT101 in about a week (a cracked PCB tracing that was obscured under a blob of solder). That was more than 5 years ago, and the TT has been functioning perfectly ever since. Others have had similar experiences. No disrespect was intended.