My seat belt springs are fine but find that the folded hood stops it from retracting back if I lean forward then sit back.
I had the same problem on my +8 after a hood conversion.
I noticed that the seat belt guide bolted to the top of the rear wheel arch was quite small
![[Linked Image]](https://www.tm-img.com/images/2021/11/29/IMG_20211129_164348820.md.jpg)
compared to the seat belt guide bolted to the back of the seat.
![[Linked Image]](https://www.tm-img.com/images/2021/11/29/IMG_20211129_164533585.md.jpg)
I changed the short guides for a pair of the longer ones. This moves the seat belt further forward and slightly inwards.
![[Linked Image]](https://www.tm-img.com/images/2021/11/29/IMG_20211129_165314233.md.jpg)
I have found, with the hood carefully folded back, there is enough clearance to allow the seat belt free rein.
CAUTION;- I cannot vouch for the safety aspect of this modification since I haven't had time to crash-test my +8 yet!