Hi folks! Before I get started, a big thanks for all the cool info and posts that I have been reading whilst lurking around here. The willingness to share knowledge is wonderful, and I thank you.
I'm working on a 1950 Martin T-15 Tiple that has spent most of it's life in Hawaii. Thankfully, it has made the trip to the mainland intact, and there is no cracking or warping present. It's in beautiful shape, except for some wear on one side.
The environment has taken a terrific toll on the tuning machines though. They need major cleaning, and then probably more cleaning after that. Also, almost all of the buttons have broken away and fallen off.
I've ordered replacement mandolin buttons from Stewmac, which are the closest thing I can find. I knew I would have a problem, though. The bottons have a 4.2 mm hole in them, while the shafts of the tuners are 3.6 mm. Too much space. The shafts also don't really have much grip on them, as you can see in the attached picture.
So, how shall I attach these things for the long haul? I don't really want to take the chance of hammering every single one of these shafts to have a wide flange while trying not to actually bend them. I am not sure what kind of adhesive to use to make this work - JB Weld actually comes to mind as strong enough to grip on the shaft, but I'm not sure how it will like the plastic of the knobs. I suppose that the Gorilla brand CA glue might do it, but I'm not really sure.
On a side note, I was surprised to discover that the screws holding the machines on are simply clipped off to fit in the shallow space that they have! Crazy! And, sadly, those clipped ends seem to chew a LOT of wood out of the way when put in and removed even once, so I might have to to a little work to keep those holes tight.
Click here for the info.