Thank you to all above for some excellent, well explained and clear advice. Many thanks. I do not think it above a DIY function, just careful application and don't rush! I may also be using sledgehammer to crack a nut here. The floors are 'sound', Back along I fitted B6 Tillets , they were a very tight fit and subsequently left me with no adjustment. However, when I removed the old leather seats the new Tillets didn't line up as I would have liked, and in the end I had additional (non-use) holes drilled, "elongated" holes , so all in all it was nnot a "neat" job. I suppose what I really want to do is reset the Tilletts and I think to do that I wanted to do that as if the floor was virgin floor i.e. no previous holes. Because you Guys seem so knowledgeable , what are your comments? Should I be "patching" up the previous holes to start with a blank canvas for re installing the Tiltetts, my problem being I just know the new holes are "close to the old holes making it a bit of pigs ear and not accurate and back top a nice round bolt going ito an elongated mess! If I've explained myself , you'll get it! So, do I patch the old floor (And if so, what might be the best way) or am I making mountain out of nothing? Once again, thank you for you help, Regards Steve