I don’t have an answer to your question, just offer that I have my spark a little more than 2" above my wrist on the top side of my arm (right in the space between the radius and ulna) the and I like that spot. Don’t quote me, but I believe there is a lot less to worry about anatomy wise on the top side an also a lot more convenient to present to door readers than having it on the inside (and by inside, I mean palm side just so there’s no confusion)
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