This is not an answer to your question, just me inserting opinion where it is probably not appreciated and probably doesn't belong, but...
In my experience Eyepiece Projection is the most time wasting, frustrating, difficult and touchy form of photography there is, bar none. It's just plain EVIL! It is trivial by comparison to get good results using a barlow. I gave up on Eyepiece Projection over 30 years ago and never looked back. I don't know anyone who still uses it since the advent of good barlows. Good luck!
