When I replaced the chain plates on my M25, I used some long bolts to pull them into place. Also I took the old ones, cut the ends with the mounting holes off, used a dremel to file out the mounting so that they fit the square part of a 3/8 carriage bolt. Used those plates for backing plates and with the carriage bolts didn't need a second person to tighten the bolts. Used Bedit butyl tape to bed them.