I recently purchased a tangential tool from Eccentric engineering and I chose not to buy the sharpening fixture as I thought I would sharpen the tools on my Stent grinder . A bit fiddly this way so I made a dedicated fixture for the job ( I enjoy making gadgets , shades of " Chuck " ) Pics attached and in album bit . The angles are fixed by the jig so all you have to do is clap it on the Stent and away we go . Works well .