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Seems it will need more depth to the hole on that to set it low enough. Just like most vintage handles!
I would get it deeper, if needed, enlarge the hole to 23mm or so! Go with 22 mm. 20 is too...

Yeah, I really love those type handles. STILL, don't put a HMW in that handle unless you can do it yourself. I like that handle.
Lots of how-to's on removing knots and replacing here. Our pool of...

You might try that brush for a while and beat upon it unmercifully! It could break in and get softer. They often do! JMO