I'm trying to repair a wall clock. It's a "Dufa", built by Etzold & Popitz of Germany in the 1920s or '30s. It's very similar to this one on eBay at the moment:Although it isn't an exceptionally valuable clock, it keeps good time and was bought new by my great great uncle for his company office, so I'm keen to get it fixed. The problem is that the main spring has snapped. We got a clockmaker to quote for the repair, but the price was high so I want to have a go myself.
To get the spring out one either needs to remove the clock face from the mechanism, or remove the back plate from the mechanism. The former is much more attractive as you don't have to disturb any of the gears. The problem is that small taper pins (1/16" diameter at most) have been used to attach the mechanism to the face, and also to assemble much of the mechanism. However I disassemble the mechanism I will need to remove several of these pins. I know the obvious method of removal is with a pair of long nose pliers, but I tried this without success. I don't want to pull too hard because then if the pin comes free, my other hand will probably fly into the clock mechanism and cause some damage (knowing my luck). A brief inspection suggests to me that the pins are harder than mild steel and that they were hammered into place. I can't hammer them out as the narrow ends all face into the clock mechanism.
Any thoughts? How do professional clockmakers do it? Suggestions would be appreciated...