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So I have a Precision Vertical Card Compass that is showing very large deviations on certain headings not accounted for by the compass deviation card. It agrees with the card on other headings. I need to get a working compass before my IR check ride so I can practice compass turns. I think the unit is around 7 years old and predates my purchase of the aircraft but it was calibrated ~2 years ago when my panel was redone. It was true to the deviation card at that time, and it has the correction balls permanently glued in position. I'm not sure when or why it started malfunctioning, but I wonder if it's wear in the unit itself given that nothing else has changed in the past two years. Which of the below options would you suggest: 1. Attempt to recalibrate the existing vertical card compass before deciding to overhaul or replace. Maybe install a new set of balls. 2. Overhaul or replace the vertical card compass, get new balls, calibrate. 3. Junk the vertical card compass, install a S.I.R.S. compass which is harder to read but should be more bulletproof? I hate wasting time on these recurring maintenance minutiae. I don't want to waste A&P hours trying to get a compass to work that may need replacement anyway. What's the likelihood of getting it to work? Do these vertical compasses tend to wear out and fail? If I'm replacing should I go with the simpler option even if harder to read? Appreciate any experience and insight in this area. Thanks!!