Paul, what do you and Para mean that the enlarged 1902 aperture is not well defined if enlarged? How would the enlarged, undefined, 1902 aperture differ from the better defined 1901 aperture?

And what did you build up with JB Weld to improve your 1902?

Sorry for the nit picking but I'm experiencing some of these exact issues and I'd like to know my options for working with them.

Thanks a lot, though!