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Make lock hole bigger in metal door.
Then mark centerlines on the plywood block.
Clamp a piece of.
Draw a center line on the plywood and mark setback of the hole from one edge of the plywood.
Place the template that comes with the lockset on the metal door.
To overcome this problem fasten a piece of 1 2 inch plywood over the existing hole.
Then bore into the plywood and through the hole behind it.
The plywood will hold the pilot bit on track until the saw starts cutting.
Drill a pilot hole with a inch bit straight through the door.
Mark with an x the center spot for the doorknob hole on each side of the door.
How to cut a hole for a door knob in a metal door.
Cut two pieces of scrap plywood several inches larger than the diameter of the hole.