During the first attempt at installing tail wheel, the mechanism bumped into the bottom of fuselage before fully lowering and the tail wheel was not aligned with fuselage. Shims on both side were installed as a possible fix. This sort of worked but the wheel was still not aligned with the fuselage when lowered. Third attempt was to remove shim from one side and double shim on the opposite side. This solved both problems but bolt was just too short. Still need to improve bolt length issue.