The typical request pans out a little like this:
“Hi, I'm a film producer, can you
come and work for us for 6 days? It's just that the guy we called
first said he couldn't do it... but he said you might be interested
and said you were very good at what you do... The thing is, we don't
have any money, so we can only pay your expenses... But we will
provide you with free sandwiches and coffee all weekend... Oh you
need equipment to do your job? Well can't you bring your own? That
would help us out if we didn't have to hire it in...”