For more accurate shaft profiling and frequency matching. Replace the slip clutch with this bolt and tighten your clamp with an inch/lb torque wrench to get precise, repeatable frequency readings. Using a torque wrench enables you to get the most consistent readings possible every time you use your machine. NOTE: Be sure your torque wrench is an inch/lb wrench, not a foot/lb wrench. Most members report 20 – 21 inch/lb settings works for them.

When you remove the slip clutch and replace it with our retro-fit screw with a 9/16 deep set hex nut you can tighten your clamp using an inch/pound torque wrench and get the clamp pressure the same for every measurement. No more inconsistent readings from twang to twang. You will see minimal variations from twang to twang and only see them change when the shafts starts to deteriorate it’s motion.

Very simple to install: Tap out the two shear pins and unscrew the existing clamp screw and clutch mechanism and screw in the new bolt. raise the clamp to line up with the slots on the new bolt and tap the shear pins back in place and you are done. The shear pins can be removed and replaced using a nail or the handle end of a rat tail file. Insert into the holes and tap out the pins slowly. When you reinstall the pins be sure and get them centered on the internal clamp. If they are sticking out they will hang on the outside walls of the clamp chamber and will not allow the clamp to raise or lower.