Shock lower bolt
Thanks for the comments. The chain guide has a hole in it to pass the tool through. What I bought is a torx T55 tool from a MAC dealer. I'm in the process of modifing it. It costs 24 dollars and some change and when modified it will do the task easily. When removing the fastener it is a good idea to heat the lug on the swingarm to soften the locktite. Also like you said clean the head of the bolt. I would like to add that adding a little valve grinding compound to the tip of the tool will make it grip the fastener alot better. I tried to add alink to MAC tools website but they don't have a picture posted with it.