Thanks! Looking forward to your experiment!The manual solid tensioner isn't something I want to use really, stretch belts take a huge effort to get on, I can see potential for them to suit a manual tensioner, still not something I'd do, I think there's potential to overload the belt drive. On a stretch belt system the tension is taken up in part by the crank damper isn't it? Applying such tension to the R53 stock damper would no doubt compromise it, and almost certainly the supercharger snout if not also the idler pulley or tensioner arm and bush quite possibly. What I would do though, and I already have some here needing ends fitting which I'll test soon enough, is to utilise a gas strut in lieu of the one way damper, these can be built to specific gas weights 2kg, 4, 6 etc. So they add tension supplementing the spring of the normal tensioner to a point, and in particular they resist compression much better. What they would also do is shorten belt life of course. This isn't the primary concern for me though, all I have in mind is peak belt performance. These can be swapped for when required or just left on. Damper longevity could be a factor given the engine heat, although a small shield can be added to help protect from exhaust heat and the damper body can be wrapped to a degree also. I'll get round to finishing them and will make some available to suit daily or track use perhaps, the ones I have at the moment are 6kg.