Yep, I agree- any decent pen/ pencil sketch will do- speak to your supplier though. Always speak to the guy making the stuff.
If I'm asked to quote on anything I'll make my own drawing from the customer's sketch and say "this is what I'm making, is this ok?" that way we both have it in writing.
Only problem with this is if the customer is using you purely as a design house just to get decent drawings for free then going somewhere else for the manufacturing with my nice precise drawings.
I've been kinda lucky though with my customers- they can fax me a rough sketch and I'll sort out any anomolies this end which keeps them happy.
I love deadlines- I like the whooshing sound they make as they fly by.