Marschy - got home last night - fitted the HD clamp, put the RJW1C jockey wheel on... and it doesn't fit! i.e. the HD clamp fits the 500kg dual-wheel model RJW2C - not my single wheel model! (Shaft diameters different. Or so SWMBO says ;p)
Point being the HD clamp wouldn't help you anyway, assuming your stand's diameter is same as the single wheel jockey wheel (likely).
Still sorting my issues. Who wouldda thunk a jockey wheel could be such a headache!?
- Finners