The foam was glued to the plate and to measure up the hole I just cut a hole(big enough to put my hand through) where I thought the centre of the air cleaner was, then took the air cleaner off and put the plate with the foam on it over the carb and shut the bonnet. Checked everything was snug and put my hand into the hole and traced around the foam with a permanent texta onto the bottom of the bonnet. Removed the bonnet, straightened up the lines a bit and cut out the hole. I used a grinder with the really thin cutting discs and when you cut it if you go around one way it will throw the sparks up at you, but if you go around the other way it throws the sparks back through the bonnet and away from you. Then I measured in from all edges of the bonnet to the scoop and mounted the scoop.
Hope all this helps.
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