One frustrating aspect of the design of the Mustang Dynamic Vibrato is how the trem arm is attached to the stop bar--the small grub screw tends to unwind itself and allows the trem arm to fall out. When this happens you have to find the right sized Allen key to tighten the screw, but this isn't always possible when you are playing. I've read about few different solutions to this problem, including modding the trem arm by filing down sides of the arm so that there is a flat surface for the grub screw to press against, filing or griding a circumferential groove in the trem arm for the grub screw, using locktite on the grub screw, or using a threaded Stratocaster trem arm which stays in the hole better. Another solution which seems to work pretty well is to remove the grub screw and use a different fastening device. Right now I am using a 10mm M5 bolt that is usually used for bicycle bottle cages or fender mounting. The diameter and thread pitch of the M5 bolt seems to be the same as the grub screw, but bear in mind that this is for a Japanese-produced Mustang Dynamic Vibrato which I assume is produced to metric standards. If you are using an original U.S.-made Mustang Dynamic Vibrato this solution might not work, although you may be able to find another bolt with English measurements that would do the job equally well. The advantage of the M5 bolt is that it has a knurled head that sticks out beyond the socket that allows you to tighten the bolt by hand whenever it starts to loosen. It also takes a 4mm Allen key is you really want to tighten it.
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