Harvey:

Make sure the socket is completely clean, too -- doesn't take much crud and rust in there to make it appear to be smaller than it actually is. For the force required to remove the plug, a good fit is vital --- if it is really a 14mm fitting and you use a 13 on a dirty plug, you are likely to round it out, making a real mess out of it (this is from experience.....)

Peter

__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!