Sure. I will be back in the workshop in a couple of days and will take some pics. I didn't use Nitrogen, I used Argon/CO2 mix (MIG welding gas). There are two M4 cap screws on the side of the unit. The upper one is the gas bleed/charging screw, the one 25mm or so lower is for hydraulic fluid. There is a third M4 cap screw at the top of the unit, just below the upper mounting eye, also for hydraulic fluid. The tool was machined from Delrin and is in two halves, bored to fit to the outer diameter of the leveller unit (81mm). The two halves are clamped together with two M6 through bolts. The purpose of the tool is to permit unscrewing the upper M4 cap screw into a chamber which is connected only to the high pressure gas supply line (and not to atmosphere). When the leveller unit is charged to the required pressure (30 bar in my case), and the pressure is held at 30bar, the tool allows you to tighten the M4 cap screw without losing charging pressure.
