Neither do I tbh but if you stick to a couple of mill you still have the centreing effect of the spigot. When I ordered my Comp CXR's I spent a while with playing different offset wheels to get it spot on so I wouldn't need spacers. Even when I ordered them I was told they were the wrong offset but they are spot on.
I doubt your hub centrics were as low as 10mm as that doesnt leave enough meat around the spacer centric part. The smallest Ive found is 14mm.
My hubcentrics are 20mm that are on the car currently.
Half day today so will have a fiddle this afternoon
