---------------------- multipart/alternative attachment In a message dated 1/12/01 8:07:53 AM Central Standard Time,=20 istuner@islandia.is (Kristinn Leifsson) writes: > I=B4m trying to fix a broken wippen from a Wagner upright. > The problem is that there is no jack flange, but the center pin goes=20 > through a hole in the wippen "proper", so I hesitate to find a replacement= =20 > instead of fixing it, since this is not very common in pianos around here. > It=B4s been glued before, but it broke again. However I don=B4t think it=20= was=20 > glued well enough so I=B4d like to try it myself (the pieces fit pretty we= ll=20 > together) >=20 > What interesting methods might be hidden there inside your brains? > Wasn=B4t it Susan Kline that had something involving two types of glue. > Could you explain thoroughly which glues ya=B4ll have in mind, seeing as=20 > trademarks are variable? >=20 >=20 It's not clear in your post just how the wippen is broken. I'm thinking tha= t=20 the piece with the hole in it for the center pin is split. You could use=20 either slow setting CA glue or Epoxy. If you place a small center pin in th= e=20 hole while you have glued and clamped the piece together, when the glue is=20 cured, you can remove that center pin and have a nice, tight hole for the ne= w=20 one. You would sand or trim off any excess glue residue and if your hole is= =20 a bit too small, you can ream it to a size that will work. The idea of using 2 glues is this: CA glue sets slowly unless you use a=20 catalyst/accelerator. The usual accelerator is a toxic solvent called 1-1-1= =20 Triclorethylene. It has a pungent odor and many people say that continuous=20 exposure to it may cause serious health problems in the future. On top of=20 that, it can cause the CA glue to cure so quickly that it's strength as a=20 bonding material is weakened. Indeed, it "fries" and bubbles up and can end= =20 up being soft and fluffy like Styrofoam when cured rather than turning into=20= a=20 hard, plastic like material. So, there are other materials which can cause the glue to cure more quickly.= =20 Baking Soda is one. Just a little moisture is another. White or yellow glu= e=20 has both moisture and some organic material (particularly if it is a milk=20 based glue) that will react with the CA glue. The idea is to apply the whit= e=20 glue to one surface and the CA glue to the other, then assemble and clamp=20 quickly. It will set within a few minutes and probably be cured in an hour=20 or so. Finally, if this piece ends up still being a little weak, could you trade it= =20 with a wippen from the high treble? Presumably, moving that wippen to the=20 last or nearly last note of the piano where it would be used infrequently an= d=20 replacing it with a stronger part would avoid any future failure. If the=20 wippen has a damper spoon on it, however, you'd have to extract the spoon an= d=20 drill a hole in the high treble wippen for it. You could also use CA glue t= o=20 secure the spoon in the new wippen. Put CA glue in the hole and dip the=20 spoon in white glue and insert. It will cure within minutes. Bill Bremmer RPT Madison, Wisconsin ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/f4/1f/a7/2b/attachment.htm ---------------------- multipart/alternative attachment--
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