The only thing I can add is I hope you have I hone, I didn’t. I ran the 9/16 drill bit through the galley and tried to team it some with the drill bit and I still had to BEAT that 9/16 tubing into the galley the last few inches. If it was aluminum there’s no way it would have taken the abuse that stainless did. I will use the 9/16 on another block I have sitting here because it is already machined. Then it will be back to 1/2 inch house copper tubing for me (5/8 outside) as it is easier to work with.