I didn't get into it above, because it would get to be more involved that I had time to use, that there was a big difference between the Atlantic based and Pacific based FLETCHER's for Mk 32 torpedo launch systems. The Atlantic Fleet opt'd to schedule installation of the Mk 2 TLS during overhaul periods or other short-term Availabilities. The Pacific Fleet in the timeframe that the Mk 32 torpedoes were joining the operational Fleet, was operating in areas of CRISIS off SE Asia. They wanted improved ASW weapons ASAP and having supplies of the Mk 32 torpedoes, but no launcher, couldn't wait for Mk 2 TLS equipment to be sent to forward area yards like in Japan. Besides, the Mk 2 TLS was still in short supply with production schedule around SCHEDULED OVERHAULS. Plus, the DDE's based at Pearl Harbor had priority and Fleet Destroyers based on the West Coast were left naked. So, enterprising minds in the Pacific Destroyer Fleet decided to copy the design of a launcher used during development of the Mk 32 torpedo. A single pair of Drop Rails off the fantail. This was NOT the optimal launch point from the ship, the best location was from midships and over the side. The interim launcher was fabricated at Sasebo Naval Facility, Japan.
What happened was that about half of the Pacific Based FLETCHERS in about 1955 had this "interim" TLS known as PMGL (Poor Man's Gravity Launcher (system)

) installed and actually kept it for a number of years even after. Altering the boat winch location wasn't an issue.
The movement of the 5-in practice loader to the former Mk 15 TT mount location actually didn't occur until the early 1960's. The introduction of the Mk 32 triple ASW Torpedo Tubes started entering the fleet in 1957. However, many HIGHER priority units were in the pipeline before the FLETCHER FLEET DESTROYERS, including all the destroyers involved in the FRAM program. If the Vietnam War had not happened, there was a good chance that the FLETCHER's in the Active Fleet would have been phased out by about 1964 (and actually were from the Atlantic Fleet). So meanwhile, the Mk 15 torpedo tubes were kept as weight reserve. As an aside, on the 4-Gun FLETCHER's there was a weight saving measure of removing the outside pair of torpedoes from the Mk 15 TT mount and blanking off those tubes. This happened in 1957-58 time period, something that could be done by tenders without a yard period and wasn't done on the 5-Gun FLETCHER's (partly because the 40-mm guns were being removed).
The first FLETCHER to have the Mk 32 triple ASW TT mounted was USS HAZELWOOD as part of her DASH Experimental Install in 1957. The DDE's started getting the Mk 32 TT shortly afterwards, but the remaining FLETCHER Fleet Destroyers didn't get them installed until about 1960-62. That was when the Mk 15 TT was removed and the 5-in practice loader relocated.
Tom,
As for Rudder Mods, I'm not sure what you are referring to? The lengthening of the rudder started out as an ASW improvement mod to reduce the turning radius of the FLETCHER DDE's in 1949-50. It was found successful and extended to ALL 82 of the recommissioned FLETCHER's during the Korean War mobilization and ALL of the 18 DDE's.