Can you provide me with the name of the rental yard so we can address getting that unit fixed properly?
If it came loose and would just swing side to side, the gunsight may have broken off. On our older units you would need to replace the whole pivot arm, but for the last couple years we have updated it so now there is a bolt in gunsight. So, if that part shears you can just bolt in a new one instead of having to remove and rebuild that whole sub-assembly.
We can't sell direct in your area as Precision Work Inc. is our distributor and covers the Northeast. Their phone# is (516)883-2002.
If you have any more specific questions reply to this or give me a call at 866-503-8873 and ask for Dave. I'll be more than happy to help you.