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07 VLX Block Drain Plug

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I went to winterize my boat and got everything drained properly but when I went to reinstall the block drain plug/knock sensor stud on the starboard side I cannot for the life of me get the threads of the plug to grab on the threads of the block. I tried using some WD 40 and a battery terminal cleaner to clean both the threads on the block and plug, but no dice. 

I was reading on here that some people have chased the threads with a 1/4 x 18 NPT tap. I went to Home Depot and bought what I thought was a 1/4 tap but it’s way too small. 

Anyone know the appropriate tap size for an 07 VLX (monsoon 340)?

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