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That T would capture the spring nicely Something to really locate the nub would be good. If it walked sideways you'd be side hopping. A grub screw or roll pin put through back to front would nail it down.
One other thing would be the mass of the arm. I think if it was heavier it would be less likely to wander from the vibration going through it.
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Airsoft, where nothing is hurt but feelings.
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