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Hmmm, tough question, Bob. It's been a lot of years since I tore into my 140 dash (same as a 240) to work on a horridly chirping blower that was headed towards a seizure. The skinned knuckles have since healed and the flashbacks have stopped. I've since done two 700/900 heater cores, a similar PITA job regarded by many as worse than the blower motor. I wrote up the procedure for the FAQ as therapy to avoid PTSD.
If you've never torn very far into your dash then I would call replacing a servo motor an onerous task for some people. For such people, my heater core writeup has step-by-step details on how to tear into the dash and even get to and remove the front section of the distribution box for full access to the shutters and levers. For me, I have yet to replace a servo in any of my 700/900s, but have had to do the bypass in all of them. It's a matter of time and priority. If I was ever faced with a heater core again then I would definitely make an effort to source suitable servos and do a proper replacement. I could probably do it in my sleep after all the times I've been under the dash for one reason or another. My back is quite used to all the contortions.
I'd recommend starting with a bypass and decide later if you want to waste another day trying to do the servos to get a bit more air.
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now
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