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As far as the bearings go, you can fab a steel cylinder with a flange on one end with a bolt pattern. Press fit bearing to steel cylinder and bolt to frame. Just my 2 cents.
Needs more power!!!! and maybe an auto loader feature to drop a stack on it and let her rip.... ohh wait that's what I want LOL
Joking aside Very nice job!
probably a fun project. Just for some humor, now that you created a light weight/portable thrower, how is the design of those lightweight portable targets coming.
if you ever know of anyone having an interest in shotgun sports and having to do a project again, tell them make a shotgun "hull" recycling machine. (small scale) - could be profitable.