When I bought my boat I had no instruction of rigging from previous owner. Now after two seasons and reading here I realize I have a sliding Goose Neck. So far I have just locked this so it's movements are minimal by placing screw in holes in the track. So I wonder how to use this correctly. Should I raise the sail then pull the goose neck down to tighten the luff? Or should I tie the goose neck down pull the luff tight with the halyard? Or does this replace the use of a Cunningham? My sail is equipped with one. And does this require a block at the mast base?