diamond cross section shaped blades

[outcast27pa]

Hello.  I am trying to sharpen a knife for a buddy and the blade has a diamond cross section.. I have tried to use the KJ-45 but I am having trouble securing the blade in the jig.  The blade wobbles along the long axis and screws up my angle.  Any suggestions on sharpening diamond shaped blades?  Thanks.

[Royale]

What I've been doing with odd shaped blades, is to add equal layers of adhesive tape on both sides to increase thickness/adjust its shape.(I typically increase the thickness for extremely thin blades to raise my jig away from the grindstone)

It really doesn't matter to me if the KJ-45 is not closely clamped to the blade. As long as the blade doesn't wobble during sharpening, I was never affected by a wide clamp holding a thin/odd shaped blade.