Removing Faucet Handle

I am trying to replace the handle on my shower faucet. I have removed the cap from the handle to access the screw that hold the handle in place. When I turn the screw, the entire value turns, so I can not remove the handle. The handle is plastic and I'm wondering if I can just gently break it off, then I could use a pair of pliers to hold the valve while I remove the screw. Any suggestions?
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FYI - The handle is stripped and does not work that is why I am replacing it.
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The handle is plastic and I'm wondering if I can

I don't know how gently you'll be able to just 'break it off'... but you're going to have to get medieval with it, one way or another. I'd be tempted to use a dremel with a cutoff wheel to carve a slot down its depth, and then crack it open.
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Great mind think alike. I got out the dremel and cut a slot and it broke off clean. The plastic fitting over the value was broken, thus the reason I could not remove the screw. just needed replace the handle once i got the old one off.
Thanks.
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