Can anyone explain this?

The 1984 Ford Escort, more widely known among my friends as THE RABBIT, was painted and done up by my friend, Nassar, who has a garage on the outskirts of Oulu. One of the things he did was replace the badly frayed safety belt on the driver's side. As he could not find an original, he used another make very similar to the original.

When I went to pick up the car, as I was intending to drive away, I found I could not pull out the belt.

I asked Nassar. Try as he and his mechanic could, for almost half an hour, the belt refused to come out.

We agreed that I would go and order a belt from the Ford Dealer as this was such an old car and none could be found anywhere.

I drove to the nearby petrol station and after filling gas,  I started the car, and as I was driving out, I tried the safety belt, and it reeled out beautifully.

I stopped at another friend's place to get a replacement battery, as the one in the car was fully discharged. After doing that, I got in the car and before starting, I pulled on the safety belt. It refused to budge. I started to drive, and even before I changed gear, I tried the belt and it reeled out smoothly.

Since then, I have tried the belt over 50 times. If the car is stationary, the belt refuses to budge. Start the car and drive about 15 to 20 metres, and the belt reels out smoothly.

Can anyone explain this phenomena?

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