The plywood will hold the pilot bit on track until the saw starts cutting.
Make lock hole bigger in metal door.
Place the template that comes with the lockset on the metal door.
Then bore into the plywood and through the hole behind it.
Mark the center of the existing hole on the edge of the door.
Mark with an x the center spot for the doorknob hole on each side of the door.
When enlarging a lockset hole mark the centerlines of the old hole on the door.
Cut two pieces of scrap plywood several inches larger than the diameter of the hole.
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Drill a pilot hole with a inch bit straight through the door.
Draw a center line on the plywood and mark setback of the hole from one edge of the plywood.
Clamp a piece of.
Then mark centerlines on the plywood block.