For as long as I can I try not to comment or nit pick on the fit both ends of a pen for if there is a real problem with Slimlines it to me is the variation in the brass tubes and tips and tops hower I overcome this by calipering every centre band top and tip. Pen pressing is vital as well the other day I had a winding mech almost fall in the brass was so slack had to glue it in so by the time you discover a misfit its too late often. The pens shown I have enjoyed seeing they have interesting features.
Kind regards Peter.