Jon,
I finally got around to removing the needle in the machine and it is definitely a different size. I have posted a pic of the needle in the machine, one of the needles in the case and a modern needle which matched to the ones in the case and i thought would be a suitable replacement. I tried putting the 16s in the machine and keeping the same depth, would not screw on. So, i suppose the reasoning for having those 16s in the cabinet is lost to time.
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I found this thread:
Substitute needles for the Minnesota and Davis, as well as others, machines
Which also references the MTx190. If the shank is round, how do you get it in the machine, would you have to angle it somehow, or will it just work? Has anyone ever tried filing the shank to make one side flat?
I also saw this item on your ebay link:
https://www.ebay.com/itm/Boye-Davis-...-/222898971486
Would this be what i need? In the description, it does not mention the Minnesota A.
Also,
On the ISMACS
http://ismacs.net/needle_and_shank/i...edle-list.html
The Minnesota a is only listed as a 15x1, would my A be under a different Minnesota?
I know i'm asking a lot of questions and i appreciate your help.