Of course I will share. Problem is i forget the specs! I have to retrieve the little bags that specify the sizes, so look for me to modify this post over the next couple days. The 1/2" NPT sizes detailed below might not be accurate.
The tube dispensing the beer is 1/4"OD food grade plastic tubing, rigid.
A "beer tender tube" is cut close to the point where it attaches to the Heiny minikeg, that attachment gizmo is discarded, and the remnant is later inserted into the 1/4" tubing.
The 1/4" tubing is passed thru an NPT (1/2" iirc) all- female brass tee, the smallest of those that the tubing can be curved through without kinking. Leave a foot of the 1/4" protruding from the bottom of the tee, and six inches protruding from the top.
A brass 1/4" compression to 1/2" NPT fitting is carefully drilled out with a 1/4" bit. The 1/4" tube should go through very snugly. Slide it over the tube protruding from the 'top' of the tee, apply plumbers tape, lock it into the tee, and tighten the compression fitting.
The bottom of the tee is simply 1/2" NPT to whatever size (3/8"??) fits securely in the minikeg bungs.
The remaining part is where the CO2 comes in. That chain is:
3/8" flexible tubing from regulator to 3/8" quick release air tool coupling
Mount the coupler on the rear shell of the BeerTender. From there:
3/8" NPT to 1/4" compression fitting
1/4" flexible tubing through the shell of the BeerTender - drill a 1/4" hole for that. Be careful to do it near the top so you don't harm any of the electronics
1/4" Compression to 1/2" NPT. Do not pass this tube thru the tee, just feed the CO2 into it.