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If it is aluminum just about any tap brand should work ok. Just remember to turn it in and back it out to clean the chips out so it doesn't gall the threads.
I had to take 2 of the nitro pills when I got wonky feeling. Oddly enough I either didn't get a head ache,or was hurting too bad otherwise that it wasn't a concern.
I take a low dose every day after my bypass along with other assorted pills.