I was going to offer you mine, but I cannot find them. I must have lent them to someone and never got them back.

AFAIK, the only commercial loaders ever available were from Revolution and Vario. These have the big whiffle balls on the end. A fellow in England invented them; Dave Something, I can't remember now. Don't recall ever seeing Rick's or Heli-Proz offering them; so you'll probably have to order from one of the UK shops; if they are even still available.

But call around; some shop may have a set gathering dust on the wall somewhere. For some reason, these gadgets never caught on over here. That is surprising, since they are VERY useful. Could be the US-prevalent 3F attitude... "Doan need no engine break-in; doan need no steenkin' head loaders to check the ship out before pulling pitch!"