Received a little Kel-Tec P3AT .380 from an online gun auction yesterday in really rough shape. In addition to dried mud and sand inside, no finish on metal, accumulated hardened ackumpucky, and heavy "Chew" marks on the grip, It will not do more than dimple a primer. I've thoroughly cleaned, scrubbed, and soaked everything so the gun is as good as that can get. However, the firing pin is inaccessible unless the screw holding the spring on the outside of the rear of slide can be loosened. The slot is buggered up to the point I cannot tell if the screw is for an allen wrench, "star" bit, or what. Anyone know what fits said screw ?