A few years ago I was removing the headliner from my E-Type and found that one of the headliner retaining brackets was fastened with slotted screws (see pic) and the other with Phillips screws. The slotted screws came out without a hitch, while the Phillips side was totally corroded, and none of the screws were going to budge. Obviously this is OEM since nothing had been touched in the headliner since the car was assembled.
I first tried my trusty old MAC "woodie" -- but it simply wouldn't bite enough and started to round off the screw. In cases such as this, I try my old impact driver which usually loosens the fastener quite easily. Unfortunately, the postion did not allow for the impact driver.
This is the business end of the MAC "woodie"
Next I tried some older Craftsman Pro (WF's) -- again, the screws started to round off.
I went through several different brands of drivers to find one that would bite -- none seemed to do the job, until in frustration I decided to give these old Snap-on PoziDriv models a try. Well, they broke those rusted Phillips screws free in short order. Not one screw rounded out -- amazing!!! Just to make sure, I double checked the screws and they were indeed Phillips, not PoziDriv.
Those old Snappy's certainly did the trick -- I will keep them handy while stripping this beast down further. Sometimes it's just a little difference in the profile of a screw driver that can make the difference between success and total frustration when working with corroded fasteners. :toothy9: