Logosol M8 - Manual (Page 9)

Use a ratchet strap, which you place
15 cm from the long line, to strap the
boards together. Here, you can use
the help of two friends: Weigh the
outermost boards down so that they
do not bend upwards. Hammer lightly
on the outermost boards when they
have been strapped together. Having
placed it centred in both directions on
the drawn cross, screw the temporary
board to the bottom so that the tongued
and grooved boards stay together.
A couple of screws in the outermost
boards, and one screw in the middle
will suffice. Continue to weigh down
the outermost boards until you have
loosened the ratchet strap. Offer your
friends some coffee or some other
suitable drink.
(If you have to do this alone, skip the
ratchet strap and hammer the boards
together. They will be tightly fitted
together anyway.)