Thumb Turn Pilot Screw

[chunk]

Hello everyone. I was wondering if any of you had tried the thumb turn pilot screws on your carbs. I am interested and ran across these from Win Cycles. I have searched online and this seems like the only vendor, which is odd. Thoughts? Thanks.

Here is the link.

wincycles.com/p9055/Kawasaki-EN450-Carburetor-Pilot-Air-Thumb-Mixture-Screw/product_info.html