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Yes I discovered that. I did line it up using he original chisel point but I think that must have been wrong to start with. It was looking at the section on refinishing existing primary facets and the bit about starting from scratch with a brocken drill to set me on the right track.
I will use the flutes for alignement for the first grind rather than the chisel point.

Yes I am using the lower stop see photo and also photo of what is happening. the second pic shows the start of the attempt to grind the secondary facets and how it is actualy cutting into the primary.

When I start the secondary facet process I drop the table down to horizontal, screw the secondary stop up the shaft until it touching the lower face of the primary stop. THen I raise the angle of the table to try and get the heal of the drill to touch the stone and this is where it all goes wrong. The bit of the drill that seems to touch the stone is the edge of the primary facet that I have just ground. So if I grind at this setting I will be cutting into the primary facet! Where am I going wrong, or maybe what step am I missing. I have watch two different vieos and as far as I can tell I am doing exactly what they do.