AND DON'T EVEN THINK OF TRYING AN OVERHEAD JOIN AT A WINCH SITE GLIDING CLUB!
Prior permission should have let you know that, but we had a chap who actually kept his little plane at our gliding site who suffered a brain failure on return from elsewhere. Fortunately the winch driver noticed, otherwise he might have been reeled in like an unfortunate tuna....
No two airfields alike, that's the rule.