Just get a needle valve from napa its part number 6820 only $8 and it will do the same exact thing except it can be turned by hand :tu:
I was wondering the same thing with the needle valve. I was also looking at them and they look pretty simple seems like you could just buy a 90 and a allen screw drill and tap the 90 and you have the same thing from the hardware store for under $5 prob I havent tried it has any one else made their own or is there more to them that im not sure of.
