Hmmmm. The wheels in my head are spinning again

Well I slept on it and made some calls this morning. Then I called Grainger and ordered the stainless tubing I posted above that is a little thicker than the brass. Two 3 foot pieces will be here from Ohio tomorrow so that should be enough for the two machined blocks I have here. 72.50 shipped to my door so for 36.00 a block it will save me from drilling and risk harming my machined blocks.