I have a arc840 that I have never flown. I want to test an old slingshot bar I just got off ebay. It doesn't have a front line flagout but it does have oh#@%$#! loops and both backlines and the right backline has an adjustable stopper bar pretty far up the line. Does anyone know how far up the line it should be to safely flag an 840 arc? Also with the stopper on the right side does it matter which side of the wind window I activate the flagout in order to safely self land the kite?

Thanks
Jason