This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment Not sure about this particular piano but I have repaired several block = separations like this successfully. The procedure is relatively = straight forward and follows along what you suggest. I see no reason = why placement of the back posts should be relevent, if they do extend = through it will add just that more strenth to the repair. My general = method is as follows: Reduce the tension off the piano. Remove the = plate screws across the top, (above the tuning pins). If there are any = particularly bad areas that extend into other areas, remove some screws = there as well if you are able to get to them. With a long bit drill a = hole through the screw holes extending all the way through the back side = of the piano. Pour epoxy down the separation through the top, (West = System from Pianotek comes to mind). Insert long carriage bolts through = the holes from the back of the piano so that the rounded end will fit = smooth against the back of the piano. Attach a washer and nut to the = plate side and tighten until the separation closes and the bolts are = tight. They will remain there permanently in place of the original = plate screws. Let the piano sit 24 hours to allow the epoxy to = completely cure. Pull the tension back up and tune the piano. The = repair should be permanent. Note that instead of carriage bolts = standard machine bolts with a washer may be used but you should consider = countersinking them on the back side so that they will not stick out. = The sole purpose of this is to prevent them from gouging a wall behind = the piano. Rob Goodale, RPT Las Begas, NV I just looked at a late 1980s Baldwin studio, serial #1417324, style = #4023 (model number?), with a pinblock separating from the back assembly = (about a quarter-inch separation). The piano has 3 backposts, but the = back assembly is covered with veneers. Does anyone know if the backposts = on these pianos extend to the top of the back assembly (top of back = assembly also covered with veneers - yes, I will be able to tell when I = yank these veneers off - but was curious before I get into it). Any = knowledge of this Del? The three top plate screws are centered over the = three post centerlines, so I suspect they may extend up to the top. The couple times I have done this repair has been with older = instruments where the backposts did extent to the top - and of course I = through-bolted through them. If, by chance, this is a piano - like some = Kimballs - where the backposts terminate at the base of the top back = assembly (about at the pinblock bottom), has anyone done this type of = repair on that design? I see no evidence that the rear portion of the = upper back assembly has moved - appears that only the pinblock has = moved, so I suppose it would be just fine to epoxy and through-bolt to = the back of this design. Anyone aware of any pitfalls I might not be = seeing here? Also, any non-bionic technician willing to share how many hours they = have taken to do a repair like this - start to finish, not including = pitch adjustments and tuning (just clamping, drilling, bonding, bolting = and cleanup)? Thanks ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/5d/8d/33/34/attachment.htm ---------------------- multipart/alternative attachment--
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