Paying an expert to travel to your shop, diagnose a problem and install a few parts, might cost more than the machine is worth. However, if you can fix it yourself, then the cost would be much less; maybe only $100 to $300.
You didn't say what's wrong with either of your underpinners, but if you give us a clear description of the problem, the experienced framers here may be able to help you. Often, adjustments or proper lubrication can solve the problem.
For your Inmes underpinner, parts are probably not readily available. Some Inmes owners, who really like their machines, buy spares to cannibalize for parts to keep one of them going. Inmes underpinners have a relatively low resale value. Sometimes a needed part can be custom fabricated locally.
For your Fletcher/AMP/ITW/Mitre Mite/Putnam/Minigraf underpinner, nearly all parts are readily available from stock. By trial and error, or maybe by simply observing, one can usually determine which parts are not working properly and identify them using the parts list. The repair generally involves disconnecting a pneumatic tube or two, replacing the faulty part, and then
correctly reconnecting the tubes.
Below is contact information for some professional service technicians I've heard good comments about. They all have their specialties but may be able to help you.
Framing Equipment Service Technicians:
Bill Moxley
Moxley's Equipment Service
PO Box 355
Lehigh Acres, FL 33970
Phone: 239-425-5727
Email:
moxleysequipment@comcast.net
Bill is an independent technician who travels. He services joiners, saws, vacuum presses, laminators, and other picture framing equipment.
__________________________________
John VanDeveer
827 Holcombs Pond Circle
Alpharetta, GA
770-331-3936
Email:
mouldingman@gmail.com
__________________________________
Daniel Ross
The Frame Whisperer
35 McKown Rd
Douglasville, GA 30134
470-539-0301
Email:
framewhisperer@gmail.com
Anything Cassese
Pistorius Saw; Eclipse; Heat Presses; INMES; Brevetti
_________________________________
Dewey Heintz
201 PR 856
Bluff Dale, TX 76433
dewey57@me.com
254-485-7036
==============
CMCs are more complicated, and the makers generally have in-house tech support people that can often walk you through an economical fix with a few recommended parts. Some also have routine maintenance/repair programs and traveling service representatives, but a service call can cost $2,000 or more for time and travel expenses.