Not exactly a homemade tool but a useful modification which may be of use to some.
I have a Chester model B, 3 in 1 lathe, mill, drill. I wanted to replace the standard tool post with a quick change model. I asked Chester which would be suitable and they sent me the T1 piston post which is widely available. They did say that it would need some modification to fit and not entirely understanding their suggestion I came up with my own solution shown here.