Mkay.
Mkay??? What the fuck is that? It appears you seem always have a know it all come back, my friend…
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Marking a case to see how it engages with a die is a useful technique to know about, rather than discussing whether any one individual finds it useful for their process. Mkaaaay 
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I often use a Texta to highlight interference on assembly’s. Might try the carbon trick next time, probably easier to clean up afterwards.