Nice to have a little treasure box full of small section HSS.... Never walk past anything like this, hoover it up!
The cutter installed, sharpening comes later....
I popped it into the lathe and scribed a centre line at right angles to the orientation of the cutter with the cutter already in the lathe as I am sure it's at centre height.
Then found the centre under the VM and locked the table.
Then I cut a slot with a 3/8" cutter and widened it a touch as the usual bit I use in the nose is about that. I have to have the bit in the original nose so I can lock it into the clapper.
I admit to 30 minutes overtime because doing the final fitting was a fiddly job. It's a very close fit.... In case you're wondering, any final adjustment to orientation can't be done by loosening the nose as the set screw on the cutter is buried in the extension. I fitted it with the cutter as near vertical as I could get it. Any small adjustments can be made by slackening the whole head and rotating it. All I need now is a 5/16" set screw to lock the nose. I'm pretty sure I could leave this out as the extension is such a good fit but it will loosen up in time. All the set screw does is hold the extension on the back stroke, the cutting forces are transmitted direct to the clapper.A satisfying morning! No slip ups so I'm pleased....