After fitting those, you can clean the leaves out of the gutters and re-felt the shed. That's what I get told anyway.
Sigma 48t slipper clutch. Our range of slipper clutches Got a small discount from Neil Spalding but still expensive, hopefully worth it though
Get in touch if you want a set in Ti. I got a set from this bloke down road who sells them cheap. Less then £10 IIRC...