Nice work. Hoping to have a workshop of my own someday where I can tinker with making slip joints.
Can you show us some of the equipment/tooling you use?
Here are a few pics.
Before I made my first slipjoint I was intimidated by all the machines and tools used by some makers. They are nice to have but you don't need a lot to get started. Part of the chalange is working out how to do things with what you have available. A lot can be done with hand tools.
I have the luck that I can order flat ground steel to my specifications.
I order my blade steel in 2mm and spring steel in 2.2mm. I also have bronce washers in 0.1mm made to my specifications. This way I don't need to relieve the liners.
I have a nice workshop and a good grinder. I grind sitting down. I also have a pantograph machine that has multiple uses.
Inlay shields, mark/number blades and I use it for nail pulls/nicks.
I don't have a disksander, this is how I keep the sides straight
And after using up a Dremel I got a Foredom. A very handy machine.
And you need sandpaper. Lots of sandpaper. Never buy cheap sandpaper, it doesn't work.
Also sandingstones (edm) are very handy for steel pre and post HT
I used a 1:50 reamer before. Today I used this 1:100 for the first time. I think I prefer this one but I messed up the knife somewhere else.
This is what I use for an anvil at the moment. It is all about using what you have.
I'd like to get a real cutlers stiddy, a small slip joint makers anvil but I haven't seen them for sale yet. (If you have one please let me know

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Since there is a washer on either side and the spring is that much wider as the blade it is something else to mind when peening the pivot.
I use a thin piece of 0.1mm bronce wrapped around the spine to keep the blade centered.
And the pantograph. She may be older then I am.
So if tou think about making a slipjoint, just go for it.
There is good info on youtube to get you started, there are a few books and
*this* is where the makers help eachother on this forum.
I hope this helps, or at least people enjoy this bit of background.