We have an order for -19.00 for a two year old child:( . I would like to attempt grinding a biconcave in an attempt to 1)make it look a little better and 2) just plain make it easier, weve had problems in the past with higher powers flying off the finer even after adjusting the stroke down. My question is this, how steep can you go when grinding the front surface? I'm not finding a semi-finished bi-concave poly sv blank to use so I'm forced to try and make one.
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