If I were to drill a hole in the rod, that is the way I would do it. I have been running 3 or 4 McCoy 35's for the last 10 years or so, and I just run lots of oil, mostly. 25 to 29% castor, 5 or 10% nitro. I have not had any of mine wear the rod on either end, and all of mine have little to no wear in the shaft brg. After a couple of years of hard running, or a really lean run, I expand the top of the piston by tapping on it with a small hammer to get the compression back. They really are a nice running motor for stunt. I use 10-6 APC props most of the time, but they will also run nice on 10-5's and 11-4's. They work well on either uniflow or standard vent, depending on what works best on the particular plane you have it on. I run Thunderbolt idle bar plugs.