The OD of the nylon hose is 10mm, so I just grabbed a 10mm drill bit, drilled a hole, then ran a M10 x 1.0 tap through the hole to give it a little bit of some bite on the hose. It leaves some small marks, but not bad. Note: I had to fix my press tool by cutting one of the halves off completely and drilling another bolt hole. The way I made it originally didn't have enough spring to let the hose out the top.