<!doctype html public "-//W3C//DTD W3 HTML//EN"> <html><head><style type="text/css"></style><title>Vellum Hinges [was Velum Source - Old European Square Pian</title></head><body> <div>At 5:36 pm -0800 14/2/07, Jurgen Goering wrote:</div> <div><br></div> <blockquote type="cite" cite>...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 BlŸthner back action velum hinges.</blockquote> <div><br></div> <div>I had a look today at the damper bodies of an old Kirkman from the days before they switched to a centred flange.  Blowing up the original picture and roughly measuring the visible slot on the computer, it looks as if it is something less than 0.2mm, which would include a small amount for the glue lines.  I think I have a few of the hinges to replace, so I'll make a point of measuring the old vellum with the micrometer when I do this.</div> <div><br></div> <div>I'll be taking a set of BlŸthner strings to a colleague tomorrow and it's quite likely his damper action won't be perfect, so I may get a chance to measure these too.</div> <div><br></div> <div>JD</div> <div><br></div> <div><br></div> <div align="center"><br></div> <div align="center"><img src="cid:p06240803c1fbc46f06b1@[10.0.0.1].1.0"><img src="cid:p06240803c1fbc46f06b1@[10.0.0.1].1.1"></div> <div align="center"><img src="cid:p06240803c1fbc46f06b1@[10.0.0.1].1.2"></div> </body> </html>