Darryl, How I found 'perpendicular' is by getting the SCP exact only once. Then I marked a fine line on the Dec and RA axis so I can return them there each time.
Yes, you still need to do a drift alignment on that 1st occasion to make sure you have the SCP, but from then on, by using the marks, it is easy to set up perpendicular.
There is no 'easy' SCP alignment, but this way is far quicker. By following the tips in the links Eric supplied to my method, and an initial marking of perpendicular on your mount head, you'll find it very quick and accurate.
Just to test it, follow the suggested method, then do a drift alignment. You should find that it is spot on
