if i may make a helpful suggestion....
my cop bike's springer bolt flew out of the assembly as i was tooling down the road, causing quite the wobbly side-to-side action.
i remedied this by gooping some jb-weld at the very end of the bolt (shown in blue).
i loosened that bolt until it a couple threads cleared the backside. that way i get the most suspension from it. if you tighten the crap out of the main bolt, it'll compress the spring and be as stiff of a ride as though it wasnt there. defeating the purpose.