I am guessing that you have had problems in this area? (Pretty insightful of me, eh?)
I haven't had issues in that area but I can see where the locking screw could be a problem. I personally would have gone with some sort of pin with a spring rather than the screw but nobody asked me.
That being said I think just about everyone here would agree that Marshall is really good with support so why not send them an email or give a call? I would be interested to hear if other people have had this problem.