Do you want to keep the spline properties so you can move the arm?
if so, I'd suggest to take a straight spline or cylinder, convert it to poly and attach your end cap, and the use a "bend" modifier to bend the arms.
I'm sure you could rig the arm, but I have no idea how that'd work
well i figured it out thanks to you guys, i tried both and came up with the idea to create a line add a skin modifier bones and then add my arm object with the path deform, and i also added more segments into the arm to make it look correct
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if so, I'd suggest to take a straight spline or cylinder, convert it to poly and attach your end cap, and the use a "bend" modifier to bend the arms.
I'm sure you could rig the arm, but I have no idea how that'd work
prbably going to make the arms shorter