I have rebuilt the latch hardware on the sliding main door on my MV34 numerous times; where the stress of slamming shut has ripped the threads out of the aluminum latch frame within the door frame. Two rounds of JB Weld (metal filled epoxy) failed and I finally used a diamond saw and abrasive cut off discs on my Dremel to cut a notch in both sides of the aluminum housing of the latch where the attachment screw threads ripped out and fitted/epoxy'd stainless nylock nuts into the space to accomodate new flathead machine screws.
Reply here, email or call if you want more details/encouragement.
Sliding Door hardware
Sliding Door hardware
Candy Chapman and Gary Bell in Stray Cat, MV34 hull 12