I recently ordered a pair of these:


1) How well do these work with a round bucket? Seems to me there should be some sort of shim with a curved side to fit the side of the bucket.

2) Should there not be some sort of a gasket on the inside of the bucket? It came with a O-ring at the front and one at the back that comes into contact with the outside of the bucket (or should - I have my doubts as this thing is flat and the buckets are rounded).

Any tips on using these things?