a 360 "weighted" converter will have 2 weights close to each other on the front flat face. any converter may have a thinner weight on the curved back side & reason is that the weight on the curved back side is used to balance the hunk of metal that the converter is when mfr'd to a neutral balance then if it is going to be made into an externally balanced unit for a 360 then 2 weights are additionally added to the front flat face. EDIT yes use a TC with NO weights on the front along with the B&M plate for external balanced setup