Chalking or painting is the process of making a stripe across the tread and driving it a bit stop and look where the chalk / paint wears through first :

In the middle ? too much pressure .

On the outer edges ? too little air .

This method can be used to find tune the traction of anything, not just fancy high end racers .

Only 900# plus driver, that must be very fun to drive .

The W123's fuel tank has a solid welded on filler neck, no hose .

I tried to remove it nut the junkyard guy insisted his yard ape do it, that guy was nice but clueless and yanked the crap out of the tank, pulling the inner, left edge whilst bending the filler neck on the right edge by a good 2" .

This was the only junkyard I found that didn't punch big holes in every tank....

Most oldies go to the crusher with the fuel tank still in , maybe I should find someone local breaking a 300D, I wanted the 22 gallon tank on my 240D instead of the 18 gallon original one .

__________________
-Nate
1982 240D 408,XXX miles
Ignorance is the mother of suspicion and fear is the father

I did then what I knew how to do ~ now that I know better I do better