On Mon, 03 Mar 1997 18:05:09 -0700 Vince Mrykalo <mrykalov@BYUGATE.byu.edu> writes: >I was called to service a piano that has an instability >problem. It is a Hoernung & Mueller (Danish made) 7' >grand that has plate bushings and the pin block was >not fit properly to the plate flange at the factory (so I >assume). Vince We invert the piano on blankets and backfill the crevice between the pin block and plate flange with a thin Hysol #1051 epoxy, made specifically for the foundry industry. This has really solved these tuning instability problems for us. I've done it on Hyundais (every piano they make needs this), Young Changs (ditto), and even Yamahas. It has ALWAYS been beneficial and apart from the task of inverting the piano, removing the lid and hinges, it is very simple. We never do any letting down of the tension either. Apply it into the crack with a paper clip or piano wire, using a mirror and a strong light to see what you're doing. I prefer this to shims any day and the fit is much more complete. You can buy the Hysol from a distributor here in Somerville, MA, Malcolm Stevens. I can get more info today at my shop. It is a two part epoxy and is rather cheap in comparison to some types and it is made for use next to cast iron. David Sanderson Littleton, MA Pianobiz@Juno.com
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