Screw for dial: under some conditions these little screws have an annoying habit of unscrewing themselves as a result of vibrations. Don't take it personally if this happens to you. We suggest you tighten the screws on a regular basis—perhaps each time you calibrate the indicator—so that they won't fall out and jam up the works. It's a little bit like tightening those screws on your eyeglass frames, before they fall out—probably while you're on vacation somewhere. Hair springs can be daunting so we've made a hair spring and gear assembly available. Just remove the old gear and hair spring, and replace with the new. See the parts list above. Crystal replacement: the bezel is threaded and unscrews. Hold the lower bezel plate steady with a small screw driver or pin, placed in one of the two holes, while you unscrew the bezel. The crystals are flat and must be inserted with a crystal press. Stem attachment: If the mounting stem is bent or broken you can replace it with a bit of care. When you remove the old stem, don't lose the other parts. Unscrew A (#18), remove B (#19), tap out the bushing E (#22), save the washer D (#21) which goes on the inside, then remove stem C (#20). Reassemble in reverse order. 
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