Yup, I feel like every Jackal (and Stone, Cali, EV whatever) in that year range had that problem eventually.
Mine swelled and I had to disassemble the stupid lock mechanism and remove some material to get it to work again. Wound up doing it multiple times to get it right. I seem to remember that I might have taken off too much and risked is not working for that reason at one point. I dunno, it was a while ago.
Yes, I'd just eliminate the lock mechanism if that's an easy option.