Fitting the loft hatch catch (supplied with diagrams on purchase) Find the mid-point of the loft hatch dor edge opposite to the hinged side. This will give you your centre line (see diagram). Mark with a pencil. With the loft hatch fully closed measure exactly 26mm (1") in from the edge of the frame and mark with a pencil. Drill a 13mm (½") hole in the centre and sand off any rough edges. Pass the catch operator through the loft door hole from the underside such that the position pointer points towards the trapdoor edge. Place the travel stop ring over the operator such that the securing tag is at 45 degrees to the loft door centre line. Place the catch lever over the operator and locate into the operator groove such that the lever points towards the loft hatch door near edge and fully locates within the travel stop ring. Hole centre to face inside face of hatch frame loft door. If a new loft hatch is required, its thickness must not exceed 20mm (3/4"). Consider the weight of the trapdoor and the security of the hinge screws. Chipboard and MDF may not be suitable. Use the existing cover as a template to cut out the new piece, ensuring a slightly loose fit all round (3mm (1/8") maximum). Your DIY store may be able to do this for you.   Fixing the Location Bracket When turned to the correct position, the catch lever will engage in the location bracket to hold the trapdoor shut. Fix as follows: Position the catch location bracket as shown in diagram, along the horizontal line. Mark a vertical line on the inside of the loft hatch frame corresponding with the centre line of the trapdoor catch. Measure the thickness of the loft hatch door, add 9mm (3/8") to this. On the closing edge of the hatch opening, draw a line this distance up from the bottom edge parallel with the opening. Match up the indent mark on the bracket with the vertical centre line. Make guide holes with the bradawl and fix, using two 20mm wood screws supplied. Secure the travel stop ring using screw. Secure the loft catch assembly with M12 nut ensuring the nut is tightened sufficiently to allow the catch to rotate freely without any looseness.