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A video by Jim Snell, for 25 years, formerly a spokesman for the GasGas motorcycle company. ~ Aware that few people on Earth possess the detailed knowledge of the older GasGas Trials machines, Jim has chosen to share some of his videos that cover the mechanical aspects of these older machines built prior to 2002. In this video, Jim Snell, shows you how to easily replace the bearings in your linkage arms (dog bones) on your modern trials motorcycle