When I was a university tech, it was a standard procedure, for any and all studio uprights that came into the shop, to get Tee-nuts in the bottomboard to replace wood screws. With pelican springs, for example, we would replace the screw nearest the fulcrum with a Tee-nut and bolt, leaving the original screw furthest out on the spring, as it bares relatively little stress. Frank Emerson ----- Original Message ----- From: "Ron Nossaman" <rnossaman at cox.net> To: <pianotech at ptg.org> Sent: Friday, February 18, 2011 8:31 AM Subject: Re: [pianotech] Bottom Board Material > On 2/18/2011 7:10 AM, Terry Farrell wrote: >> Baltic Birch has many thin laminations - is that correct? > > That's the stuff. > > >>Are the inner >> laminations reasonably hard for good screw holding? > > As far as I can tell, it's the same stuff throughout, unless it's changed > since the last time I used some. That sort of thing happens more than I > like. In which case, t-nuts. > > Ron N >
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