Thanks Jazz. The other issue is that the parts were suppose to be 15mm +/- 0.1mm, but are in fact 15.2mm - 15.25mm. Any chance of bringing them down to 15mm, so taking 0.2mm of the top?

The ripples are only visible on a single edge on one part, so not a biggie, but the ridge is present in more than 50% of edges.

Regards,
dsc.