Adjustable height conduit leg system

This design is used to mount 3/4" conduit legs to the ends of a FreeMo module for model trains. I have successfully printed this object and have them installed on my modules for further durability testing. The mounting slots are sized for #8 sheet metal screws. The bosses are meant to be drilled and tapped 10-24 for a thumbscrew to retain the leg while moving the module.
All parts have been designed to print without support
The upper part of the leg is 3/4" EMT conduit 30" long
The lower