IndeedAdding to this to vent, but just got some shimano cranks with the clinch chainring. I thiught they were using a cassette tool to fix but no, need a new tool to fit them. Wish I had known as could have ordered ot whilst waiting!
That's what I've just ordered, but rebranded different name. Same two o ring designIndeed
I’ve got the RISK one from eBay - came quickly and is a very good design - two o rings to hold it in place - works brilliantly.