Logosol M8 - Manual (Page 21)

Hang the side boards up on the
bottom. Fit them as closely together
as possible and push them onto the
bottom, but make sure that the carved
10 mm line is still completely visible.
Start at the future back of the hot tub
and fit the next board in the direction
of the tongue. Gently knock the boards
together both at the top and bottom. If
a board is too bent to fit, discard it.
Assembly
The last board: If the gap is less than 10
mm, you can pull the hot tub together
using ratchet straps. Otherwise,
you remove a board so that the gap
becomes 140 mm, for instance. Mould
and cut two narrower side boards that
will fit in the gap when they are fitted
next to each other, i.e. 70+70 mm
(excluding tongue and groove).