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I'm pretty certain it's mechanical & I could probably write a short thesis on what was speculated & evaluated leading up to this. Last week the motor came off & run up independently (perfectly smooth). Head was evaluated piece by piece down to the bottom. Everything looks clean & in great...

I have a CCMT holder set from way back (OMG the prices have gone insane!). But it uses the insert in different orientations you don't see on many generics. One is a true 45-deg in orientation you show. Another uses the 'rarely used' wide angle point of parallelogram. Mentioning more in case you...

Sorry, I don't know much about these kinds of model engines. I did a search & was kind of surprised there weren't a bunch of active builds on the forums I frequent. Maybe you are familiar already but this channel has what looks to be relatively recent (but early stage) vids in progress...

I've been sorting through a kind of a background harmonic resonance issue on my (single phase 220V mill). A few forum buddies have been in the loop. I made some good 'mechanical progress', its certainly much better than it was. One of the things that came up in discussion is apparently some...

the left one IMP (although it also does MET) http://theoreticalmachinist.com/Threads_UnifiedImperial.aspx the right one MET https://amesweb.info/Screws/metric-external-thread-dimensions-chart.aspx as I mention in my other post about metric threads, there can still be differences, presumably...

Pitch IMP = 20 TPI = 1/20 = 0.0500" Pitch MET = 1.25/25.4 = 0.0492" So 0.00079" pitch difference assuming both are the same thread angle. Can you turn whatever screw you are operating a maximum number of turns & measure physical displacement? Even 10 turns would amount to 0.008" difference...

I've used Bondo to make impressions. As long as the surface has a thin film of oil it will release OK. But don't get yourself into unchartered troubles, test it on a bolt or something beforehand. Not the best for threads because you could only get a half diameter impression, but maybe helpful if...

And then there's ACME (29-deg) vs Trapezoidal (30-deg)

A tiny crackle & it rotates perfectly free. Well, as smooth as can be expected by printed striations of what are theoretical round parts, axle & hole. I didn't realize till I printed it, has an integrated stop profile so it's 0-180 hinge. My setting is 0.2mm on 0.4 nozzle. I'd take a pic but I'm...

Presumably the crank has a dial to confirm physical displacement over N turns assuming its in good shape which should define pitch. Without seeing it up close you are kind of down the path of detective work & educated guessing which might only get you so far. We assume it was made or procured...