They were a little higher than the top of the adapter plastic.
The top was take down with 220 grit on a block.
I still left it a hair high to follow up with the next step.
These tunnels are about 3/16" wide, that could leave a gap against the curvature of the tube.
I wrapped some 220 grit around a 3/4" wide dowel and sanded a slight curve into the flat bottom of the tunnel.
This dip running along the bottom will fit the tube better and also lower the top so it will better match the molded tunnel ends in the adapters.
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