Could you explain the sync connector-socket?
No, I haven't disassembled that part since the problem was not there, if it works don't fix it.
What is the use of the intermediate bore? It has no electrical function. Could it be intended as a mechanical fixture?
Uhm... I'm lost here, do you mean the big cylindric thing at the right? Maybe the answers follows below... If you mean other part let me know, I could be lost in translation.
I do not know this connector from other appliances so it seems proprietary and not a standard 3-pole plug applied on a camera that only needs a 2-pole one.
I quote camera-wiki "
In 1949, the Makina III replaced the Makina IIS, with the full flash synchro (electronic and magnesic), a shutter locking button, no self-timer and a holding plate with two tabs attached to the right side of the front plate, where in previous models the diaphragm selector was located."
By the way, parachutist seems not the right term. Freefaller would be more apt....
Joke mode on // Indeed
freefaller would fit better if I wanted to say the camera felt/jumped by itself but I can't imagine why any camera would do that to a certain "death" or future disfunction so I thought the camera had a plan not to hit the ground and that's why I guessed the parachute didn't work, about where you can wear a parachute in this camera, my guess is inside upper frame hiding, so opened and held by the upper scissors would make the camera waft softly and land in horizontal position. I could be wrong of course, airbags were not invented by 1952 so... // Joke mode off.
The camera was CLAd by Frank Marshman 3 years ago, I saw some very nice details, I haven't done anything than fixing scissors, shutter works great, focus and other operations are fine. The big job I did it in my Makina II months ago, the differences between these two are the flash socket and some screws here and there and of course Lens in front of shutter in Making III.