Given the age of your car, it should not be a surprise.
Following years of use, unless rebuilt and done well, the bonnet sides at the front and rear centres deform slightly. Furthermore, the brass centre strip retaining brackets wear badly, particularly the front one allowing the bonnet sides to slide forward. Remove them and inspect; I'll be surprised if you don't see considerable wear in the form of two circular marks.
I hope that this helps.
Last edited by Cheshire_David; 07/06/17 01:36 PM.
