I had two of these (on separate occasions). The first worked flawlessly, using the stock pump and no surge tank. The second was a constant pain -- the arm hung up near the end of records, and other problems I can't remember but that destroyed the styli on at least two cartridges. This arm came with the Wisa pump and fancy surge tank. Finally discovered, after selling it, that BOTH the pump and the surge tank were defective. Nothing was wrong with the arm itself. Moral: stick with the original pump. Bruce Thigpen of ET was extremely helpful, by the way, but couldn't solve the problems that the pump/surge tank were creating.
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