It would seem that EBCo liked and supplied tall cylindrical butt cans for its boats, and likely Manitowoc followed suit. They have a flat tab that fits into vertical slot straps on ladder sides, table edges, etc. all over the boat. They are made of heavy metal and were much more substantial than the thin, larger stamped metal ones we got from Suisun Bay reserve ships (surface). COD has two given to us by one of our shipkeepers who was aboard the CAVALLA. He removed them as souvenirs at the end of the war. Likely the all went home in the seabags of smoking sailors. We need about 40 of them aboard COD... someday if and when we get drawings, we will have them fabricated.
Our FTR officers head has one, and one is bonded to its mount in the MR, next to the couch.
Paul