More concerned about the dentist.
I was looking at a mill type similar to Elmer #33. I've made one but it could have been better ran on 3psi, could not blow it to go. After a while tends to make one feel faint! all that puffing, Well it does me.
So I have been designing it and undesigning it for 18 months. Then I found Alibre spent hours and hours learning that.
Not really for any reason, I just wanted to.
Also doing a write up on "How to design your own oscillating engine" someone asked me to do which turned out to be more time consuming than I imagined.
Dave