I ordered a couple nozzles from the UK that said they were compatible with Ultimaker, but the threads were too short for my heat block,
You can adjust a little bit - if you take it all apart (while hot!) - after removing the nozzle, screw the threaded tube further in from the top so that it goes further into the aluminum block (the peek part will be much closer and there will be a shorter cooling distance but it should be fine).
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nick-foley 5
Makergear sells them. They have a female thread, however, so you'll need to purchase the brass M6 tube they sell and either cut it down or replace the UM brass tube with it.
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