Hokey Dokey ........
YES. Dromia posted part of the answer. Several lustrum ago, I developed "Stick, Mark 1, A1. Stick is made up of two cut down 45 Schofield cases. Epoxied on each end of an appropriate length dowel. Then drilled through for a brass wood screw, epoxied in place and cut to act as a "stop" to prevent the stick from entering and naming the action. You can cut several dowels to whatever length you need. The cartridge cases on the ends insure the dowel will run free in the Mag Tube.
I like the Uberti copy of the original Henry Ladder Sight. However, I have opened my real sight up a bit to give more of a sight picture. You will also find the "graduations" marked on the Uberti reproduction don't actually pertain to any specific range/load. They just look good. I actually prefer a "flat" sight to a Buckhorn or similar.
The Henry barrel and magazine are going to get warm. A full magazine of smokeless ... real warm. 5 rounds, not so much. Now, a full magazine of BP and the barrel will get dam'd HOT. Take a glove with ya.
As an addendum. IF you can find an original Henry for sale, take your broker. Your going to need a lot of money. Once you get your original Henry, you don't get to shoot it. There is NO ammunition available. Well, there is ammunition available. Collectors have all of it. A box will cost somewhere around a Grand. There isn't enough difference in strength between current reproductions and an original Henry to spit at. Current Henry frames are proofed for current SAMMI spec 45 Colt and 44-40.
Coffinmaker