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When you drill a hole all the way through an arbor you compromise the strength of the arbor in the place where you drill it. If you do drill it, I think I would drill a smaller hole than the cut-out hole and make a rivet that is large enough to fit snugly into the square cut-out and have a smaller piece protruding through the drilled hole.You could then stake it where it comes out on the other side of the arbor. I probably would use silver bearing solder to secure the rivet in place and then clean it all up.There is a lot of pressure on the arbor at that point, so save as much of the original arbor as possible. Others probably have a better idea.The hook for hooking the main spring broke off on the strike side main wheel. I'm thinking of drilling a hole through the arbor and making a replacement hook using a nail. Is that the best way to go? Thanks for any help.
I see David’s illustration has been posted. That sounds even better.
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Dick, you position is quite correct IMHO, however, OP states that he replaced 7 bushings in post# 26. I believe the OP has attempted to address wear issues he found in order to have a reliable clock after reassembling and testing. Only time (pun intented) will tell.Wow!!
60 posts and not a mention of bushings installed or of checking for wear.
JMHO
Dick
In the last 30 years or so, I have not seen a 124 that required only 7 bushings to make it a long lasting, reliable repair.Dick, you position is quite correct IMHO, however, OP states that he replaced 7 bushings in post# 26. I believe the OP has attempted to address wear issues he found in order to have a reliable clock after reassembling and testing. Only time (pun intented) will tell.
Royce
Thank you, Royce and Will. The threads that Royce references say either drill through the arbor and tap the hole and use a screw or drill through the arbor and use a nail. I like Will's idea - I think what I'm going to do is start with a finish nail and shape the head to make the hook and turn down the other end to fit a small hole in the arbor and peen it on or rivet it on. This is going to be ticklish. From what you are saying, the smaller the hole I drill in the arbor the better off I'm going to be.When you drill a hole all the way through an arbor you compromise the strength of the arbor in the place where you drill it. If you do drill it, I think I would drill a smaller hole than the cut-out hole and make a rivet that is large enough to fit snugly into the square cut-out and have a smaller piece protruding through the drilled hole.You could then stake it where it comes out on the other side of the arbor. I probably would use silver bearing solder to secure the rivet in place and then clean it all up.There is a lot of pressure on the arbor at that point, so save as much of the original arbor as possible. Others probably have a better idea.
Dick, how would you repair the broken hook on the strike side main wheel arbor (see picture in post #59 above)? What approach would you take, and what materials would you use? Thanks for any advice.Nails are made from very poor material and are not suitable for clock work.
If one has ever tried to turn that material in a lathe, the truth would be quite evident.
Nails were designed to be driven into wood with a hammer.
My first preference would be to build a new arbor from good quality machinable steel or to check with David LaBounty for a used one.Dick, how would you repair the broken hook on the strike side main wheel arbor (see picture in post #59 above)? What approach would you take, and what materials would you use? Thanks for any advice.
I've been able to take the springs out of the spring boxes this way but not put them back in. Will have to try this next time. Do you use just your hands or a pair of pliers? I guess you start with the outside and work your way in?I often just do them by hand. Unwind from the center, keeping one hand on the spring so it doesn't jump out of the barrel. Don't pull any more than necessary. Just unwind. You wind it in the same way. Fast and easy when you get used to it.
Looks like an excellent job and outcome. Congrats!Thank you, Royce and Will and Dick and shutterbug for the suggestions on how to fix the broken arbor hook. I basically followed David LaBounty's directions from this thread: https://mb.nawcc.org/threads/winding-arbor-hook-is-broke-off.17343/
His method is to start with a machine screw and he has some very helpful diagrams on how to file the screw head to shape the hook.