One of the big disadvantages of screw driver slotted grub screws, is that all too often we (and I bet that includes almost all of us at times) dont use a correctly ground screwdriver, with the result that the tip spreads the "legs" of the screw slot, and that tends to jam the screw even tighter, or at worst, snap off one side of the screw making it (almost) impossible to remove. Compared to that Allen screws are excellent, but, as Jeff says, a pinch of sealant or similar to block up the 'ole, is batter than allowing time and dirt to do the same thing. ___________________________________________________________ NEW Yahoo! Cars - sell your car and browse thousands of new and used cars online! http://uk.cars.yahoo.com/ MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.