Trombone body - sold as junk

This is a modified CONN 88H from the 1990s.
The F attachment has been modified by a professional repairman to function as an As or G valve. There are no issues with the slides or playability, but due to the modifications, it will be sold as is (junk). It will be shipped in an old custom case within a size 180 cardboard box.
Please confirm the following points:
- If the valve caps are tightened too much, the rotary valve action will become stiff.
- The mouthpiece shank is a standard large bore, not a Remington.
- The case is heavily used and in poor condition.