I'm looking to get a tremolo arm for my SA160 because it didn't come with one when I bought it. I've tried a vintage (threaded Strat-style) arm and an Edge Pro arm but neither of them worked. The cavity where the bar is supposed to go in appears to be smooth, not threaded. What am I supposed to use?
This bar will work http://cgi.ebay.com/Ibanez-Guitar-Trem-Bridge-Drop-in-Whammy-Bar-Chrome-/160616508486?pt=Guitar_Accessories&hash=item25657d6c46

It's really overpriced though. Maybe someone else knows where to get that bar for a more reasonable price.
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