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Re: [ATM] trepanning mirror



Aki Lötjönen wrote:

>Hi,
>
>Gregorian 8 inch f30 sounds like exciting project!
>I have tried two methods of making the center hole to a primary as follows:
>  
>
{snip}

> Just
>plaster the core back, seal with candle wax and that's it. Finalize
>grinding, polishing and figuring.
>
>Regards,
>Aki Lötjönen
>
>Ok, looking for suggestions on a blank I bought from surplus shed. an 8" f-4 blank,,
>  
>

problem is  already has been cored nice beautiful core..  but now what 
should i do with this gaping hole in the center,

Sure would make grinding easy with MOT  just add grits & water through 
the hole he he eh

But seriously,,  what's the best procedure when no core is present?

Joe
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