Philip: Is this a drop action? You might look at the jack stop rail. If it is set too close, your jack will wedge itself between the rail and the butt. If this is the case, loosen the screws and slide it toward you just a little. I would also check the blow distance. If it is too far, you might also have this problem, since a compact spinet action (short hammer shanks) has to arc more than one with longer shanks. This means that your hammers will be leaning back at more of an angle, and that the jacks are more likely to get jammed up. You could try lessening the hammer blow by shimming up the hammer rail. Put in a punching under the rail temporarily and see if it helps (adjust the lost motion to compensate). Also, check to see that the checking distance isn't too far (again, the shanks are going to have to arc more if the checking distance is too great, thus the shank/butt will lean back at too great an angle). Hope this helps. Good luck! Paul McCloud
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