I swapped mine for a different generic brand (can't remember the make but can look tomorrow).
Cost me about £9 from Academiy Divers in Sowerby Bridge. One of the staff members uses Cyklons and suggested it as a replacement
a couple of bolts on a lump of quarried rock.....shock, horror......I think the land owner should bolt and start charging in these times when agcriculture has to diversify
I'd look at climbers or ex climbers first. Not as if they (we) haven't caused enough issues at Almscliffe in recent years...