Gentlemen:
I could use a little (well maybe a lot) of advice on a ST 5 Bell Sonora clock. A couple days ago the mainspring broke on the time train. I had the time to pull it out of the case last night and I saw something that I’d not seen before. There are small brass wires (springs) wrapped around the Hour Hammer Arbor and several others. They look to be return springs for the arbors. My question is how do you go about taking them off? They are wrapped around the arbor and through holes in the plate and look like they have never been removed. The rest of the repair is rather straight forward, maybe a bent pivot, damaged wheel or pinion. Also on the same topic…what is the length and strength of the spring required on the time side? Is there any sort of repair manual on this movement? Now just one more question (I seem to be full of them) how do you go about removing the Chime Mainspring? Since I’m into this clock I might as well do it right. It looks as if the potential for property damage and personal injury is high for this operation!!! I was thinking of using a lathe and building a barrel clamp to hold it down to the cross slide. Any thoughts! Maybe someone has a picture or drawing for a spring winding fixture?
I could use a little (well maybe a lot) of advice on a ST 5 Bell Sonora clock. A couple days ago the mainspring broke on the time train. I had the time to pull it out of the case last night and I saw something that I’d not seen before. There are small brass wires (springs) wrapped around the Hour Hammer Arbor and several others. They look to be return springs for the arbors. My question is how do you go about taking them off? They are wrapped around the arbor and through holes in the plate and look like they have never been removed. The rest of the repair is rather straight forward, maybe a bent pivot, damaged wheel or pinion. Also on the same topic…what is the length and strength of the spring required on the time side? Is there any sort of repair manual on this movement? Now just one more question (I seem to be full of them) how do you go about removing the Chime Mainspring? Since I’m into this clock I might as well do it right. It looks as if the potential for property damage and personal injury is high for this operation!!! I was thinking of using a lathe and building a barrel clamp to hold it down to the cross slide. Any thoughts! Maybe someone has a picture or drawing for a spring winding fixture?