There is usually a bit of give in Skywatcher focusers, so you're really just aiming to get it close in the "wobble position" your focuser would normally be in use. Whatever tool you use, its probably a worthwhile exercise man-handling the focuser assembly a little to see how far it affects things.
Arguably you could say any focuser wobble will magnify the difficulty of getting colimated well with a laser more so than a cheshire.
Most of this really didn't dawn on my until collimating using cateye tools. Realised pretty quickly my focuser was way down the quality scale compared to the catseye.
At F5 you've got a bit of give anyway. Very capable scopes 8" Skywatcher
