preload

Has anyone on here had any experience with there's do they work? or are they just an add-on to look pretty? Fit Yamaha MT-07 FZ-07 14-15 Blue Billet Fork Preload Adjusters Stabilizer | eBay

due to my small size and weight I have to reduce my front fork preload, has any one sourced or know of, replacement front fork preload adjusters for the mt,s. its a fairly common fork on the 07 so I think they may be out there.