Here are some recognized and reputable sources for projector parts and repair in the US.
Please add additional topics for UK, Europe etc. Thanks!

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Urbanski Film
We repair Bell and Howell 16mm and 8mm, Elmo 16mm and 8mm, Eiki, and other models
We sell Bell and Howell and Elmo parts
We provide service and repair for Tobin Video Transfer TVT Telecine equipment
Please inquire...
Larry Urbanski, 708-460-9082
Website: www.urbanskifilm.com
Email: orders@urbanskifilm.com
Located in Illinois

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
RB Multi-Media
"Eiki/Elmo Sales and Service since 1975"
Rich Burgess, 828-595-3398
Email: rbfilm@msn.com
Located in Hendersonville, NC

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
RC's Classic 16mm
"Service and parts for B&H, Elmo, Eiki, Kodak Pageant, Telex/Singer"
Richard Patchett, 248-980-6488
Email: patchetts@comcast.net
Located in Flint, MI

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

https://16mmprojectorrepair.com/

Robert,
Thank you for posting this...I will try and contact him to see if he is still offering services...

There is also a Facebook page.