As I promised here is the parts that make up a complete windsurfing equipment:
For starters ‘ power base ’ in translation the mast or how you want you guys to say, is an important piece of the highest a windsurf, makes the connection between the plate and the sail, exemplify and at the right time. We must not forget it at home, it happened to me and I had to get out of the way, what was I just liked it 
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Further we have the mast foot, another small piece and very important the fixeaxa in the lower part of the mast and scripetii that they see in the image and with the help of the sail cloth is tensioneaza according to instuctiunile marked on it
Mast extension as you already figured out as ii says the name is an extension of the flagpole. What do I know of are platforms of different sizes from 400 or even lower to 520 cm. You can not find the sail to the mast at potriveasaca you have, so the extension is. With an extension of 50 cm to a mast 430-460 cm can cover a wide range of sails (up to 8.5-9 m2) without further invest in another mast which usually is expensive, especially one that has high carbon content.
As I was saying here inscriptionarea on vela, base = 24 cm means that we need to set the extension to 24 cm, luff length = 454 cm represents total mast + extension. So for the sail of the image which has an area of 6.1 m I need a mast extension + 430 cm 24 cm.
Boom or ghiul he is and of different sizes in width to fit the dimensions of the velei divesrele. As you can see he has an extension of about 50 cm. for a nervous cat best of velei watch instructions on where the tag boom sail you will find how much you should spread this ghiul so that to have the sail's recommendations after tensed.
Uphaul rope or scota if I understand well how I say us is another important part of this f. windsurf engine. No she did not sail out of how the water, if not you know waterstart and no longer need . I hope to learn and I on vacation this year not the other but I kinda hurts back
Last but not least the Fina catch plate and is it different, not here on these details to orality (f. major by the way). I will come back soon with a new chapter ‘ How montam ’ . Pleasant holidays!