If you own - and actually use - one or more hand planes you've probably damaged the lever cap screw while tightening or loosening it - with the nearest, close enough, screw driver. I'll admit that I have done that - more than once.
So when I see that Lee Valley has a special tool, specifically designed for the lever cap screw tightening and loosening - think grear shift knob shape, with brass collar - and inside the collar - a short slot head screw driver blade - (Plane Screwdriver 50K39.01 $14.50)
- and it's right next to the Veritas Side Rabbet Plane I was ordering - I added it to my order.
Having now used both - I really like the Side Rabbet Plane. The Plane Screwdriver - not so much. The screwdriver blade barely sticks out beyond the brass collar so you can't see that it's engaged the slot in the cap lever screw. So there's a lot of fishing around and guessing "Is it in the slot - or not?" And if you THINK it is - and it isn't - you can damage the screw slot.
Now - if the blade were spring loaded - so it stuck out far enough so you could see that it in fact was in the slot, then retracted a little so the collar could fit around the screw head - then bottom out so you could safely turn the cap lever screw . . .
OK - so it's "just" an under $15 tool - but it's from Lee Valley!