Point of order...these tools are actually "Spark plug BOOT pliers" and they are
used to remove the rubber-like cap from around the plug. They aren't strong
enough to be spark plug wrenches that actually seat or extract the spark plug.
So, no, if you've tightened the PL-259 with Real Pliers (tm) you won't be able
to get it off with these. The reason you use these in the first place is that
you don't have enough clearance to get Real Pliers (tm) on the PL-259 to
tighten OR loosen it. The heavy-duty boot pliers have enough oomph to get the
job done in tight quarters.
Note - there are light-duty versions of boot pliers that are not hefty enough.
They are made of lighter-gauge sheet metal and can't grip the PL-259 firmly
enough while applying torque.
73, Ward N0AX
TowerTalk mailing list