Thanks for the advice Viatron. I shall be VERY careful for future use. My intention here was to have a fixing I could pull into ....hopefully I will never have to remove the floorpans. When I fix them permanently I will put a bead of mastic underneath so that it sqidges out when pinched up tight and HOPEFULLY ... reduce any rattle/make a watertight seal.
This is what a forum is all about ... learning from others past experiences.
Cheers. More piccies to follow after this week end.
Slarti