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Thread: Neck heel crack repair on beater mandolin?

  1. #26
    Adrian Minarovic
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    Default Re: Neck heel crack repair on beater mandolin?

    Quote Originally Posted by kdlrd View Post
    Thanks for the advice, I will look into epoxy (I may actually have some around). The difference is that the people sending rockets to the moon knew what they were doing, while I don't
    I would advice against using epoxy unless you disassemble and clean the parts. Epoxy is incredibly strong stuff and had great gap filling property but it's adhesive strength is very poor when used on contaminated surfaces or some incompatible materials. In this case even if you manage to get the epoxy into the crack n good quantity (epoxy is one of the worst in this respect except some very thin varieties) and clamp it, the epoxy will just fill the space between lots of glue and filler. So you'll be basically gluing the failed filler and glue back together and not gluing wood to wood. I've handled enough of these mandolins to be pretty certain the neck was fitted pretty roughly into oversized mortise and secured in place with pins and lots of glue to fill up the space. Any final gaps filled with putty and finished over with the opaque poly lacquer. You may hope yours is better but I wouldn't believe untill you look inside.
    Adrian

  2. #27
    Registered User Tavy's Avatar
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    Jun 2007
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    Default Re: Neck heel crack repair on beater mandolin?

    I would also advise against epoxy: it forms a brilliantly strong joint, but a malleable one, which is to say it will move over time, exactly what you don't want here. And once it's in there, it's impossible to get out again.

  3. #28
    Registered User
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    Vancouver, BC, Canada
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    Default Re: Neck heel crack repair on beater mandolin?

    exactly right, difference between luthiery and alligator dentistry made plain. if i had a mandolin like this, "$0 value but i like how it sounds", i would force the neck completely off (causing unknown amount of damage), clean the mess inside all the way to good wood (if there is any), glue it back using marine-weld epoxy, making sure all voids are fully filled. main difficulty would be to keep correct alignment and to prevent epoxy from running out everywhere. i would spend no more than two evenings on this, 1st to get the neck off, 2nd to glue it back. i would probably use a bolt-and-nut and some spacers to hold everything in alignement. after the strings go back, expect two surprises: neck is bent, action is mile high, and A strings do not stay in tune because cheap tuning machines. time wasted, $0 value mandolin ruined? instead, i could have watched many cat videos or learned 1 new tune...

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