I'm needing to replace the depower line on my bar and on the Peter Lynn kite site it has two different sizes on two different parts that it specifies. Either 3/16"(5mm) or 5/16"(6mm?), 3/16" is like 50 cents per foot when 5/16 is 1.30 a foot. Would 3/16" be fine? Or should I just go with 5/16?

you have to do the knots,
the smaller will work but will be sloppy in the bar but makes tidy knots

the larger would be my choice the knotting is a little harder but the flow is tidy in the bar.

Ok, I kinda thought along those lines. I thought the smaller would be a little loose. Thanks Phree. Now on to pick some up at the local boating store