Quote Originally Posted by old kodger View Post
The trick to undoing screws like that without an impact screwdriver, is to use a drift and whack it on the end before even lifting up a screwdriver. This marginally drives the screw forward releasing the tension. Did it with some brake drums only yesterday, (mind you that tells you that my workshop is a mess and I can't find the impact driver).
This is very important. Without or before an impact driver.