In the spirit of Dragnet, "all you get are the facts, sir!!"
Thin? yes, the finished OD of the pen will be .444"--both ends are the same, so the Jr. Gentleman is about 15% larger. Because my "prototype" ran into operator error, it is not here, so I cannot give you weight today, but I will get it for you.
The two tubes are the same OD and ID, so it is possible to confuse them---the shorter one should be the "cap" end. As we noted earlier, the material on the cap should be 1.6875" long, according to Berea. This will leave a VERY short length of brass tube exposed as the tube starts at 1.87--about 2/10" Again, carefully glue the part to the tube and let it set overnight before putting the cap on the pen (or it may be there permanently!!)
Due to the length of the rollerball refill being consistent, the overall length will be the same as the other rollerball pens.
The nib is a nice two-tone, but it is an IPG. The Heritance nib is a direct replacement, the fit is excellent, using the stock feed unit.
Berea is calling the pen the "New series style Screw Cap" Fountain pen or Rollerball. Assembly, once we found the correct amount to turn off, is straightforward.
BTW, we penmakers refer to this as a tenon, it really is NOT. You simply turn down to the brass, shortening the material by less than 1/8", then secure the "center band" which has the threads.
Yes, the threads are metal to metal--the few I have tested have gone on easily and fit well. At least we know the customer will not crack the plastic insert, since there is not one!!
Any other questions, please feel free to ask. The pens I have are Chrome plated.
Both a converter and a cartridge come with the fountain pen, from the manufacturer.
That's the low-down!!
Thanks for asking.