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Nope. Unfortunately this is the most common glitch in the game (common as it most complained about). Randomly usually in Gloria's theater the cobweb duster likes to disappear from your inventory. This is a bit of annoyance as they're no way to fix the glitch without either reloaded an old save where you have it still, use cheats to buy a new one, or grind through getting the arrowheads again. Either way it's not that great a situation and unfortunate that it happened to you. We're still not entirely certain why this only happens to some people playing the game and not others.