<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; = charset=iso-8859-1"> <META content="MSHTML 6.00.2800.1226" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY> <DIV><FONT face="Comic Sans MS" color=#000080></FONT> </DIV> <DIV><FONT face="Comic Sans MS" color=#000080>----- Original Message = ----- </FONT> <DIV><FONT face="Comic Sans MS" color=#000080>From: "Joseph Garrett" = <</FONT><A href="mailto:joegarrett@earthlink.net"><FONT = face="Comic Sans MS" color=#000080>joegarrett@earthlink.net</FONT></A><FONT face="Comic = Sans MS" color=#000080>></FONT></DIV> <DIV><FONT face="Comic Sans MS" color=#000080>To: <</FONT><A href="mailto:pianotech@ptg.org"><FONT face="Comic Sans MS" color=#000080>pianotech@ptg.org</FONT></A><FONT face="Comic Sans MS" = color=#000080>></FONT></DIV> <DIV><FONT face="Comic Sans MS" color=#000080>Sent: December 17, = 2003 10:18 PM</FONT></DIV> <DIV><FONT face="Comic Sans MS" color=#000080>Subject: Re: A Hitch = in a Hitchpin/Del</FONT></DIV></DIV> <DIV><FONT face="Comic Sans MS"><BR><FONT = color=#000080></FONT></FONT></DIV> <DIV><FONT face="Comic Sans MS" color=#000080>> Del said: = "Ed,<BR>> > I had the same dilemma with a Charles Walter Grand, which has = "Spring<BR>> Pins"<BR>> > for hitch pins.<BR>> <BR>> No it doesn't. It = has groove pins.<BR>> <BR>> Del<BR>> <BR>> <BR>> Del,<BR>> I beg = to differ with you. The "groove(d) pins" are known a spring pins.<BR>> = Reason being is that their primary use is to connect a spring to a = fixed<BR>> point. I was not referring to the spring steel pins, as in Baldwins! I<BR>> = believe if you were to type in "spring pin" in your search engine, you = would<BR>> come up with the same "pin" that you designed into the Walter. Sorry for = the<BR>> confusion folks. This must be my day for being misread/misunderstood. Damn!<BR>> Oh well, Happy Holidays anyway!<G><BR>> Joe Garrett, RPT, (Oregon)<BR>> Captain, = Tool Police<BR>> Squares Are I<BR></FONT></DIV> <DIV><FONT face="Comic Sans MS" color=#000080></FONT> </DIV> <DIV><FONT face="Comic Sans MS" color=#000080>Hi Joe,</FONT></DIV> <DIV><FONT face="Comic Sans MS" color=#000080></FONT> </DIV> <DIV><FONT face="Comic Sans MS" color=#000080>And I beg to differ = with you...and, yes, I am well aware of their use. After all, I did = introduce them to the piano world. </FONT></DIV> <DIV><FONT face="Comic Sans MS" color=#000080></FONT> </DIV> <DIV><FONT face="Comic Sans MS" color=#000080>The pins specified are = either a 'Groov-Pin Type 67' groove pin or a 'Driv-Lok Type G' groove pin: = </FONT></DIV> <DIV><FONT face="Comic Sans MS" color=#000080></FONT> </DIV> <DIV><IMG height=35 alt="Type 67" hspace=0 src="http://www.groov-pin.com/graphics/gp-typ67.gif" width=119 = border=0></DIV> <DIV><FONT face="Comic Sans MS" color=#000080></FONT> </DIV> <DIV><FONT face="Comic Sans MS" color=#000080>The terms "groove pin" = and/or "spring pin" refers to how they are fixed to the hole not to their = intended use. For example, a 7/32" (5.5 mm) groove pin has a body size of just under = 7/32" and easily fits into a size-on-size 7/32" hole. It is fixed by the friction = fit of the three staked grooves extending approximately 1/2 of its length. See = the illustration below:</FONT></DIV> <DIV><FONT face="Comic Sans MS" color=#000080></FONT> </DIV> <DIV><FONT face="Comic Sans MS" color=#000080>The staked groove = before insertion:</FONT></DIV> <DIV><FONT face="Comic Sans MS" color=#000080></FONT> </DIV> <DIV><FONT face="Comic Sans MS" color=#000080><IMG height=88 = alt="Figure 1a" hspace=20 src="http://www.groov-pin.com/graphics/gp-fig1a.gif" = width=225 vspace=5 border=0></FONT></DIV> <DIV><FONT face="Comic Sans MS" color=#000080></FONT> </DIV> <DIV><FONT face="Comic Sans MS" color=#000080></FONT> </DIV> <DIV><FONT face="Comic Sans MS" color=#000080>The deformed groove = after insertion:</FONT></DIV> <DIV><FONT face="Comic Sans MS" color=#000080></FONT> </DIV> <DIV><IMG height=87 alt="Figure 1b" hspace=20 src="http://www.groov-pin.com/graphics/gp-fig1b.gif" width=226 = vspace=5 border=0></DIV> <DIV><FONT face="Comic Sans MS" color=#000080></FONT> </DIV> <DIV><FONT face="Comic Sans MS" color=#000080></FONT> </DIV> <DIV><FONT face="Comic Sans MS" color=#000080>There are a variety of = groove pins standard to industry. The Type 67/Type G is just one of them and it = is the only one with an annular groove machined in one end. True, this type of = pin is often used as a spring anchor, but it is also used as a pulley axle, a = pivot pin, etc. The annular groove can be (and is) machined to a variety of configurations depending on need.</FONT></DIV> <DIV><FONT face="Comic Sans MS" color=#000080></FONT> </DIV> <DIV><IMG height=93 alt="pins5.gif (3997 bytes)" src="http://www.driv-lok.com/Parts/pins5.gif" width=320></DIV> <DIV><FONT face="Comic Sans MS" color=#000080></FONT> </DIV> <DIV><FONT face="Comic Sans MS" color=#000080></FONT> </DIV> <DIV><FONT face="Comic Sans MS" color=#000080>A Google search for = "spring pin" turns up a variety of resources, most of them referring to spring pins = as "roll pins" or "split pins" or some such. The "spring pin" (see the diagram = below) is made of 'spring' steel to a diameter slightly larger than the hole it is = to be driven into and is fixed to the hole by spring action:</FONT></DIV> <DIV><FONT face="Comic Sans MS" color=#000080><IMG height=117 alt="spring1.gif (2865 bytes)" = src="http://www.driv-lok.com/Parts/spring1.gif" width=320></FONT></DIV> <DIV><FONT face="Comic Sans MS" color=#000080></FONT> </DIV> <DIV><FONT face="Comic Sans MS" color=#000080></FONT> </DIV> <DIV><FONT face="Comic Sans MS" color=#000080>Regards,</FONT></DIV> <DIV><FONT face="Comic Sans MS" color=#000080></FONT> </DIV> <DIV><FONT face="Comic Sans MS" = color=#000080>Del</FONT></DIV></BODY></HTML>