<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Terry, I think the PTA in question is the (British) Piano Tuners Association.  They hold conventions similar to the PTG, if somewhat smaller.<div><br></div><div>The secondary spring in the upright action is a repetition spring which allows for a very fast repetition.  The same system was used in some North American brands such as Bell (Guelph)<br><div> <span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Verdana; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; ">Jurgen Goering<br>Piano Forte <br><a href="http://www.pianofortesupply.com">www.pianofortesupply.com</a><br><br>......................................<br>Terry wrote:<br><span class="Apple-style-span" style="font-family: monospace; white-space: pre; ">Those conferences are a waste of time - totally useless. Unless of course you really value accessibility to cookies and brownies! You're certainly NOT going to learn a darn thing about pianos at them. And I'm really quite surprised that those books would be available there......</span></span></div><div><br></div><div>....<span class="Apple-style-span" style="font-family: monospace; white-space: pre; ">And what do those springs do? Simply add more spring in the same manner as the more common coil jack spring?</span></div><div><span class="Apple-style-span" style="font-family: monospace; white-space: pre; ">Terry Farrell</span></div><div><div><br></div></div> <br></div></body></html>