We still have to fine a way to determine what a "firm" bushing/center pin is? David Ilvedson, RPT Pacifica, CA 94044 Hi David... I have never thought in terms of grams... have always just gotten a feel for things. For the whippen, I just disengage the spring and move the lever and the jack. Both should be such that you feel some resistance. The rep lever center should exhibit enough resistance that you can easily feel the pins tightness. It should'nt be so tight as to feel outright stiff... but it needs to be good and firm. The jack needs also to be a bit firm but less so. It shouldnt move on its own if you tilt the whippen, but it should fall slightly with a slight tapping on the whippen. In the "D" I mentioned earlier... the tech had also taken out a fair share of jack centers and replaced them with looser ones. Upon given the job to fix the problem, it appeared that this had just exasperated whatever rep problems there were to begin with... as it looked like a last ditch attempt to solve the problem. That wasn't full blown CAF mind you... just slow repetition, very uneven with a good deal of jack missing. Most of the problem was fixed by good regulation and key bushing friction control. The rest was fixed by repining the overly loose jack centers and a few balancier centers and tightening the rep springs. A slight bit of key kick back was brought back into evidence, which tho some techs think should be absolutely absent, I find necessary in very moderate amounts. Cheers RicB
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