I have also replaced the shoulder bolt 3 times...and have gone through 2 new sets of stairs...real pita! However, I have a fix...drill out the hole with a 5/8 bit and install a hardened bolt with a nylon lock nut. Gives the gear a lot more to press against when it finishes out it's rotation, instead of a dam* welded thread. With a little flex and a lot more overall support, it's working better than the last new steps I got. Seems to have really tightened up the stairs too...they don't feel like they'll break if you walk down them!
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2013 Georgetown 351DS-CHF, Tiger Trak bar, RM Steering Stabilizer
2013 Jeep Unlimited Sport
-Blue Ox Towing Set-up, RM Braking System
--Life is Good...!