I also have a Quik Lok QL742 that had the same problem about a year ago. I think I may have initially called the Quik Lok phone number listed above and was put in contact with the guy in the message included below. The guy below promptly arranged for Quik Lok to send me a whole new stand. FWIW I also have an older Quik Lok version of the QL742 from the 90's that is still alive and ticking. Although it's second teir is less adjustable than the newer QL742 and it weighs quite a bit more, the old beast simply won't die.
Here's my Quik Lok contact info:
Jesse James B.
(Customer Service Representative)
A 310 W. Newberry Road. Bloomfield, CT 06002
P 855-562-6270 (ext.3766)