<div dir="ltr">Joe,<div style>The metric measurement is a real one. I encountered that thread on a Kimball brass rail that I duplicated. My machinist over in Pendleton had to order the tap. It's a rare size.</div><div style> --John Ashcraft</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Thu, Feb 21, 2013 at 9:18 AM, Joseph Garrett <span dir="ltr"><<a href="mailto:joegarrett@earthlink.net" target="_blank">joegarrett@earthlink.net</a>></span> wrote:<br> <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I'm in the process of making some Chickering upright brass plates and I'm<br> trying to figure out what size threads have been used in the original<br> applications, the ones in the past and what is used today. Anyone have a<br> clue? I have some screws that came with various replacement plates and I<br> have a bunch of screws that came out of an original piano brass rail<br> applications. Each one is different! Yikes!! I have identified one as 3-48<br> threads and another as 3 x 0.5mm, (I think, but not sure, since I can't<br> find a tap in that size!).<G> The real question is the third one, which I<br> have scads of along with the scads of "standard" replacements plates which<br> I cannot identify in correlation with any known thread/bolt size! Anyone<br> have a clue in this regard?<br> I've called Schaff and the one guy, (Rob), who "might know" is out of the<br> office this week!<br> Gosh, I'm having so much fun.<br> Help!!!<br> Joe<br> <br> <br> Joe Garrett, R.P.T.<br> Captain of the Tool Police<br> Squares R I<br> <a href="http://gpianoworks.com/" target="_blank">http://gpianoworks.com/</a><br> <br> </blockquote></div><br></div>