I am having problems with my rear passenger side seatbelt. It will not pull out right anymore. Sometimes you can gradually pull it out but most times it will pull only a few inches and lock up. I had this problem about 6 years ago and the independent mechanic could not get the new one I purchased to work right, so I took the car to the dealer to fix. It has worked up to now and it is doing the same thing again. I bought a new belt, took it out of the box and it is locking up just like the old one so I did not install it. Is there a trick to get the new belt to work right without locking?

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1995 S-350
370K + SOLD
1952 220B Cabriolet
39K kilometers + SOLD
1998 E300D
310K +
2012 E350 BlueTec
120K