hello everyone , any advise on setting up my windsurfer i have a tiga board with a neil pryde sail.. i have every thing to get started just making sure i set it up right before i start off the water.. i used to sail boat (red witches) for a about 3-4 years when i was young.. any input on rigging and tuning.. i have a boom,mast,board, sail. on the mast it come apart i am not sure what this extension i have.. it has hole running down 13 holes with a locking device that slides. here is a photo of it..