Retractable Hose Reel Belt Spare Part – 30m

After asking for a how to replace info and not receiving it, I tried to dismantle the reel as the holes were full of something which prevented getting to what i think were posi screws rusted. I could only get 50% to move.
End being I cut out the hose and bined the rest. I still have 2 others around the house.

Ordered & received retract drive belt for 30 m Holman hoes - no problem!😀….. but…. How do you fit it? Unclamp the hose??? Etc etc??
Detailed instructions required please 🤔😎

The Hose Reel Belt always seems to last for 25 Months, Just Out of Warranty. I have thrown away 6 30 Metre reels over the years and today decided to try and order a few replacement belts to repair 3 of the units I have with faulty belts but they Are out of Stock.
Looks like Aldi Cheapies may be the answer.