by alavapint »
Tue Dec 07, 2010 11:24 pm
I'm new to the forum, so I'm not sure if I can mention a supplier.
But I have been fitting spy holes in UPVC doors for the past ten years.
Never had a problem as my door viewers for UPVC doors are of a short length, and can easily be tightened up giving a secure fit.
When I fit the inner section of the viewer I fit a 2mm x 30m nylon washer over it before tightening. This spreads the load should you worry about 'just plastic'.
When I am asked to do a door with a metal section in it, I just mark the centre of the hole using a nail, and then use a 16mm drill bit as a guide to draw a circle round it. Then drill a load of holes around the inside of the circle, and finish it off with a round file. Do that on both sides of the door, and pop your door viewer in.
Done hundreds of them (honest... I buy them in boxes of 20) and never had a problem