[SV650rules]

I have replaced shoulder bolts with washers under the head before (choose some washers with the correct OD and drill the hole in centre out to fit over the thread). Use as many washers as you need to get the height of the shoulder. Add an 'O ring or rubber washer ( tap washer) under bolt head to spread the load on the plastic part its holding. I would use threadlock if you use normal bolt with just O ring and can't tighten bolt properly though.