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Sorry, I was informed that That 5mm I posted above, should be 5cm, I am not familiar with metric scale.

I thought .52cm was 50cm + 2mm, but was informed that wasn't correct. 1cm = 10mm

My apologies for mis-stating.

But, that adjustment above, still helped my tracking greatly, it may for other, it may not, I just thought it was worth mentioning.