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The trebuchet was something I never built before. A pivot point seemed to be missing. The first attempt used launch clamps and a whole lot of struts. While it did function problems were stability and transportation. Started searching for bearing and most involved wheels and now with 1.1 those ideas seemed unlikely. @Majorjim thread was the idea for using thermometers and which now had inspired me to push further. The need for a pivot that could handle hundreds of tonnes of mass started me to ponder on using different parts. After shopping through the part list it was staring right at me. The structural fuselage. Now to find a suitable pin for the sleeve. The choice was the Modular Girder XL. + = AWESOME! The sleeve is attached temporarily to the girder using a stack separator. Then using the translation tool to place in into position. Once in the field the separators are staged and there are now two separate craft. This was the first version that functioned. The Ion plane Research Challenge was were it all began. Go for broke edition. Animated gif of functioning glider launcher. http://i.imgur.com/iYac5ZR.gifv For the longest time during this process it seemed the trebuchet was ordered from the acme parts catalog and I would hear meep-meep as another failure happened. So here another chapter begins. The creation of a functioning trebuchet. It will be portable, re-settable and be able to chunkin pumkin. This thread can also be for further research into using this pin and sleeve bearing. As you can tell this bearing can support some mass and the uses of a proper bearing are countless.