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Hi dwb,
Instead of drawing a line you could use a length of thread or string held taught by pins driven in to the base board at either end?

Laurie

P.S I have heard that the Blackwall tunnel on the Thames has a kink in the middle. Apparently the builders were worrying about parrallel bores missing in the middle so they drove them both at an angle as then they couldn't miss.
 
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