I used what I had laying around:
-Some PEX plumbing scrap; one piece 4.5” long and another 6” long.
-Some dowel that was just a bit too big to fit in the end of the PEX
-A bit of electrical tape
Total cost: $0
I used the tools I had, including a drill press (but I’m sure you could do it with a hand drill), a 3/8” drill bit and some smaller ones, a utility knife, and a handsaw. That's it.