Whilst noting that this tool would be quite useful if one had it to hand, I personally wouldn't go to the trouble of making it. I discovered, by complete fluke of circumstance, that a length of broom handle I had fitted perfectly with a light application of grease. I built up the many components on that,then tapped the steel pin through, knocking out the broom handle as I went. (There's a photo on the rear diff thread). It was quite a simple operation once I'd found the broom handle!