Dumpling, the quick and dirty fix you could try, is buy some plumbers Teflon tape and put a few wraps around the threads, then screw the handle back on. If that fails, I would then try J.B. Weld, which is a 2 part epoxy, but that fix will be a bit more complicated. If the Teflon tape fix fails, I'll PM you instructions for the J.B. Weld fix, if you're interested. It should be under $10 for both.
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