I'm in the same boat as everyone else here, but I can tell you that Mark is held in very high regard by the members of the Big Sky Model A Ford club......of which both he and I are members. I have some pending work for Mark, as well.
Mark is a walking encyclopedia of Model A Ford knowledge. I have had some long conversations with him about Model A Fords, and have spent a couple of days with him at his shop. I have the highest respect for him, and regard for his long term knowledge of Model A Fords. His father was a Model A collector, and Mark grew up working on them.
As far as I know, Mark is the only person anywhere near Montana that does babbet bearing work on Model A's.....and his speedometer service keeps him busy.....I understand he can be very busy at times, because he rebuilds speedometers for some of the major suppliers of Model A Ford parts.....many of them at a time!
I haven't been able to reach Mark lately either, but from what I know of and about him, the work he has on his plate will get done, and in a very professional manner.
Only thing I can add is to just hang in there, as Mark may be having some difficulties that are preventing him from keeping up with the work load he currently has...
eog