"What do you do when using the DX Engineering plate when the bolt (that's never been removed) hangs up in the groove on the plate while your in the middle of walking the antenna up or down?"
Happened to me quite a few times with my DXE plate in the 3+ years I've had the antenna. Replaced the bolts several times. Much easier to happen with their 43' verticals than with small verticals, like a Hustler. You do get better with practice. Best to use two people and wait for a calm day.
I use the DX Engineering tilt base with a 6BTV and replace the bolts about once a year. It's usually because I get careless or am in a hurry. If you don't lift the antenna and seat the bolts into the offset slot, and if you don't maintain upward force on the antenna while tilting it, it is very easy to bind things up and bend the bolts.
I like having the tilt base, even if I sometimes mess up. It works pretty well when I'm careful to use the right technique. I raise and lower the antenna several times a week during monsoon season because those big desert thunderstorms can be pretty exciting.