Here is a thread I started back in 2007 about my Kwikee steps rebuild.....
See if there is any info in it that you can use.....
Fast forward to today.....I still have the same motorhome...Same steps......I've had some issues with the electrics (read motor).....but, the steps joints have not been apart since I put them back together in 2007.......
Kwikee automatic steps rebuild project: From Drab to Fab!from the post linked to above.....
The final step was to reassemble the steps with new fastener hardware.........since I do not have access to OEM type rivets or a way to set them, I resorted to using off the shelf bolt type hardware..........there are 2 hole sizes used in these steps............3/8" and 1/2" diameter holes........the original rivets are two stepped with those two diameters......I used 3/8" x 3/4" shoulder bolts part number # 91264A581 and 3/8" x 3/8" x 1/2" bronze bushings part number # 6391K172 both available from www.Mcmaster.com, I had to also add 5/16" washers and 5/16 x 18 ny-lock nuts.