Hi, in my experience, in fitted a s/hand replacement switch, I just went by the witness marks left by the bolts as a guide but it worked perfectly without further adjustment. I would just fit it & see if it works, there is only a very small amount of adjustment on the switches so it won't take much to get it right if it doesn't work 1st time so I don't think the tool is strictly necessary. The Haynes manual shows you how to make one, I would take a pic of it but my FL along with the manual is nearly a couple of hundred miles away now but if someone has a manual they could take a picture of it for you but I don't think you'll need it,all the best