Greetings! I have a recently acquired rebuilt 512BB. I noticed that the left side latch of the front clamshell bonnet was continually unlatching. The supplying specialist had a go at adjusting it with other items on my snag list but it is still unlatching, albeit slightly less frequently than before. Is there a trick to getting the adjustment as it should be? I am guessing that it unlatches because the cabling is too tight but that is just a guess. I am now noticing a number of other BBs have their clamshells unlatched (always) on the left so wonder if it is a common issue. Many thanks.