I was changing my oil today and I thought there wasn't a crush washer on the drain plug so I put a new one on. In reality I actually put a second one over the original and it stripped the ending threads of the screw, so now when I try to tighten it to a certain point it gets loose again. I went to an auto parts store and found a 14X1.5 to replace it but it seems like the threads are slightly too small. Should i try putting a helicoil on the original/new plug? Thanks in advance!