Clamp a piece of.
Make lock hole bigger in metal door.
Drill a pilot hole with a inch bit straight through the door.
Cut two pieces of scrap plywood several inches larger than the diameter of the hole.
Draw a center line on the plywood and mark setback of the hole from one edge of the plywood.
How to cut a hole for a door knob in a metal door.
Take your time so you keep the.
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Then mark centerlines on the plywood block.
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.
To overcome this problem fasten a piece of 1 2 inch plywood over the existing hole.
When enlarging a lockset hole mark the centerlines of the old hole on the door.