Well, it looks okay with a new fuse. The temperature may be off somewhat, but it's probably unrelated.
The original fuse was
NSF FCT from Nippon Seisen Cable. It appears to be a medium/semi time-lag, but what I replaced it with is defined "fast".
And I don't understand what's so difficult in making a 20x5mm fuse really 20mm...
BTW, Hakko's official replacement is the
B3722 fuse board. It's both expensive and more difficult to replace than just the fuse.