I've been searching for your post in which you said that the two parallel lines were made by the bayonet lug.
I wanted to verify that that is what you wrote.... I can't find that post so perhaps you can explain it again....
What caused the two parallel lines that are clearly visible in the photo of the so called palm print?
No prob', buddy.
"It appears to me that the contact between the moveable bayonet lug and
the underside of the barrel could create some rough spots on the underside
of the barrel (which would be in the form of two parallel lines). When Day
needed to apply the tape to the underside of the barrel, all he needed to do
was slide the bayonet lug away from the print (towards the muzzle end of
the barrel. The rough spots (in the form of two parallel lines) could retain
some of the fingerprint powder. And those rough spots would show up on
the lift as two parallel lines."
See post by Charles Collins here:
https://www.jfkassassinationforum.com/index.php/topic,3030.msg114974.html#msg114974 on Page 29 of the Topic: "Ct's firstly ask yourself, where does my theory go?"
Link.