JB weld or a set screw would definitely NOT be strong enough to hold against spring tension, IMO. Besides, if you stuck in a rod, how are you going to get the spring tension back up to specs ? This job is probably similar to winding a garage door opener spring and securing it. If you don't have the right tools and knowledge, you can get hurt badly. IMHO, $115 and labor would be well worth it.
2003 Ford F-350 V-10 Crew Cab 4WD Long Bed
2004 Jayco Designer Medallion 29 RLTS 5th wheel
Bill, Gayle, and Mindi (dachshund)
Retired at last !
Nothing is foolproof to a sufficiently talented fool.