FWIW, that doesn't look like the standard brass gear, but I guess that doesn't really matter to you. The damage could be an issue if it extends down onto the gear surface - looks like it might.
Probably worth replacing both worm and gear if the mount was giving you trouble. Shouldn't cost a whole lot. Could try Tasco Australia as a first step - recall in a previous thread that Lee quoted about $40 from them for the gear. TeleskopExpress in Europe also advertises worms and gears if Tasco can't help.
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