Thu Mar 12, 2020 4:52 am by femurat
It's a super tight and precise fit. I try a few tension tools until I find the perfect one. And if I don't have it I just file one down to size.
Usually I prefer a different shape wrench, with the bottom part that extends towards the outer side of the keyway, like the key does.
This time I happened to have such a perfect fitting wrench I didn't even need another one.
About impressioning a key, I'll figure out something when it crosses my mind again. I've done what you say with a rolled piece of brass in the past. It works but it tends to bend and it's not a nice key.
Cheers