Slide out keeps getting stuck!

The RV shop sent out their specialist and he did exactly as Doug suggested. He admitted they were using the wrong bolts and FINALLY used the proper replacement ones. Drilled a new ROUND hole as well. The slide worked perfectly numerous times with levelers extended and retracted. This better be the answer, or I might have to get involved! As DH says, I'm never "subtle" when I deal with those whose workmanship isn't adequate!! LOL! Thanks again Doug for sharing your knowledge. DH shared what you posted and the RV Shop's owner acknowledged you know what you are talking about! Will keep all posted on just how well this 'fix' works! On our way to pick out a site for this weekend!!