Spyderco doublestuff sharpening help

I've made this little thingy to allow constant angle sharpening on Spyderco double stuff sharpener. It has set angle of 15 deg, with knife's grind it should give ~20 degrees per side which I consider best for retouching Your blade (and fastest), just like Your triangle sharpener is designed to work.

You basically snap it onto double stuff, index Your knife and follow this angle. It's not intended to slide entire thingy as it will clog Your sharpener. It makes sure You always start honing at t