Introduction

This lock can be used as an extra security feature to an exterior door and should be fitted well below the latch to add support to the door and help prevent a forced entry. Ensure there is ample daylight to finish the task and never leave the door unattended for obvious security reasons.

The procedure for cutting the mortice is the same weather you are fitting the lock to a new or existing door.

Step 1: Preparation
Step 2: Cut a backing piece
Step 3: Nail and string
Step 4: Apply adhesive
Step 5: Insert backing piece and apply final coat

Step 1: Preparation

Trim the hole with a sharp trimming knife to give it a clean edge.

Step 2: Cut a backing piece

Cut a backing piece from a sheet of plasterboard offcut. It should be narrow enough to go through the hole, but long enough to overlap the hole by about 1in (25mm) on each side.

Step 3: Nail and string

Bore a hole in the middle of the backing piece and thread the length of string through it.
Knot a nail or sliver of wood to one end of the string to anchor it against the back of the offcut.

Step 4: Apply adhesive

Use the grey side as the back of the backing piece, and the ivory (which will be covered with plaster filler) as the front. Apply some coving adhesive or filler to the front (the ivory side) of the backing piece.

Step 5: Insert backing piece and apply final coat

Guide the coated backing piece through the hole, then use the string to pull it into position against the back of the hole. Hold the string taut while you fill the hole. Leave room for a finishing coat, if needed to match the surround.
When the filler has almost set, cut the string flush with the surface and apply a finish.

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