I'd agree with bar and stem, but do have a soft spot for the collars
I'd say that while the stems and posts are simply unnecessary, the collars are actually evil. The correct attributes for a seat post clamp are minimal bending stiffness and a way to keep the screw straight, and the Thomson fails on both counts.
This fastener combination allows float on both sides
Furry muff, I didn't know they had a barrel nut. Still as ugly as sin and the shape departs for no good reason (other than to add extra ugliness) from a simple flat band which is the correct shape to generate uniform radial force.
I'd say that while the stems and posts are simply unnecessary, the collars are actually evil. The correct attributes for a seat post clamp are minimal bending stiffness and a way to keep the screw straight, and the Thomson fails on both counts.