The plywood will hold the pilot bit on track until the saw starts cutting.
How to enlarge hole in door for lock.
Starting at the top of the faceplate outline make a series of closely spaced chisel cuts about 1 8 inch deep inside the marks.
Take just a real small cut at a time hold tight and use every kind of safetly glasses and face shield known to man as you ll be flinging metal.
Draw a center line on the plywood and mark setback of the hole from one edge of the plywood.
Use a bevel edge chisel and hammer to square the corners of the mortise if the faceplate has square corners.
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To overcome this problem fasten a piece of 1 2 inch plywood over the existing hole.
Cut through the base of the cuts to empty the mortise of excess wood.
Clamp a piece of.
Then mark centerlines on the plywood block.
Mark the center of the existing hole on the edge of the door.
Make a series of closely spaced cuts into the mortise area.
Fit the latch and faceplate into the door.
When enlarging a lockset hole mark the centerlines of the old hole on the door.
Create the mortise using a router attachment remove the wood between the pencil lines drawn on the door edge to create a mortise for the faceplate.
Or get a rotarty rasp file bit like they use in air tools and mount it in a drill and do the above.
Then bore into the plywood and through the hole behind it.