<!doctype html public "-//W3C//DTD W3 HTML//EN"> <html><head><style type="text/css"></style><title>Re: Vellum Hinges</title></head><body> <div>At 5:36 pm -0800 14/2/07, Jurgen Goering wrote:</div> <div><br></div> <blockquote type="cite" cite>John, I am aware of the velum sold by BG. and others in Germany.  Regardless of what the dealers may say,  it is too thick and too stiff for Blüthner back actions and other action applications in vintage instruments.  The sellers are, by and large, not piano restorers and do not speak from experience.  0.3 and 0.7 mm velum is fine for harpsichord rosettes.  For the purposes we are talking about, the velum should be no thicker than 0.15 mm, otherwise the damper underlevers tend to float just a little.  I have this information from an experienced tech in Germany who has written an article on replacing the Blüthner back action velum hinges.</blockquote> <div><br></div> <div>Jürgen,</div> <div><br></div> <div>I have now collected and dismantled the Blüthner damper action.  Here is a picture of one of the bodies.  I will report in more detail later, but the vellum (dry) on this action is almost exactly 0.5mm thick.  I will measure the slots when I have removed the hinges and everything is dry.</div> <div><br></div> <div>I would agree that such a vellum might be too thick for the hinges on early squares etc. but for grand damper bodies it is fine.</div> <div><br></div> <div>JD</div> <div><br></div> <div><br></div> <div><br></div> <div><img src="cid:p06240800c1fd24fe86bb@[10.0.0.1].1.0"></div> <div><br></div> <div><br></div> </body> </html>