neutral as in throttle to center..
see if i can explain better...
first remove line from the sails do not attach instead on the end lenghts ( which will be long tie them both onto a weight and let it dangle over the side of the boat ( i used a 4oz)
attach the line to the drum...
using your fingers tun the drum to wind some length in all this you can do with your left hand....leaving the right free for he next part...
keeping your fingers over the line on the drum line clamp using your right hand reset the servo position to 0 which is throttles center .. push the drum back onto the servo and secure down with the screw,
keeping your fingers over the drum holding the lines in place pull the throttle back to wind in the line in as far as it will go .. do it slowly keep your fingers over the drum edges to keep the cable fed. ( make sure your throttle on the transmitter does not have the return spring if it does remove it ..)
keeping the throttle back you can now .. let go of the drum ...
the weight will keep the lines taught you can now secure the drums cover back on with out fear of it popping off.
once thats on you can now secure the lines to your sails and and adjust them to give you enough lenght to do what ever.. use the jibs block to adjust the tautness there, with the main boom use the boom sail hold to temporarily secure the line until your happy with its length
i really hope this helps and you can understand it better
I'm using 40Lb braided fishing line if thats anyhelp
i have included more photos however my transmitter is off and servo position is on max out not at 0 currently ( way i left it after her first run)
good luck
pics in link ( to big to upload to forum)
http://img824.imageshack.us/g/linepulledtaughttogivem.jpg/