<html> <body> <pre>>And once I ascertain the profile is there somewhere you can point me >so I know which is which? </pre>Attached is a group of flanges, Left to right: Hamburg S&S, Tokiwa, NY S&S, Abel, Renner Notice the drop screws: HSS & Tokiwa have round heads w/ Tokiwa spade end. NYSS, Abel, Renner have a hex-drive shape. Depth of profile decreases l to r along with slight shape changes. Renner has a flat center. <pre>>Even with a few properly regulated keys I still get a little >jack slap. I know that I could simply put a thicker felt in the jack window >but what I'm really after here is why this is happening. Is there a better >way to go about this than simply shimming things? </pre>With the spread being so close, the capstan is lifting too close to the flange center (fulcrum) thereby causing the front of the wippen to travel through too great a distance. Shimming the flange back, maybe even with one below the screw and two above, will decrease this travel and not cause the jack to hit the flange. Thicker stop felt will place more stress on the jack glue joint because it is being bound between the letoff button and stop felt. You need to reduce the jack's travel by shimming the wippen flange and maybe increasing blow distance and maybe even decreasing dip. BTW those backchecks looked to be leaning back at too great of an angle. Regards, Jon Page</body> </html>