NOTE: From the sketch below there are supposed to be washers in place as follows; One under the Bolt Head [but why?], and two before the nut; please confirm this during installation.
The object is to have the bolt shank protrude from the assembly only so the shank is barely visible; thus the two washers are placed before the nut so as to avoid the nut from bottoming on the bolt before the assembly is “tightened”. Additionally do not over-torque the nut; over-torque will result in compressing the bushing and thus seizing the rollers; same rule here as for your bungee rollers. Ref. Piper Assembly Drawing P/N 26351 if you have available; I do not.
The Rollers and Spacers are Owner Produced Parts