The transformation of scarf joints into slots or front slots has been enhanced significantly for the BTL and BTLx export.

There, some twenty engineers are hard at work on a handsome half-stone half-timber building.

It seems half-wood, half-ceramic, two contrasting textures that support each other.

Three chocks (17) form a layer (21) with mitred half lap joints at ends of the chocks.

In the intermediate part (19) a rebating type slot (20) is arranged in the proximity of the leg in the upper edge and a second rebating slot (21) in the lower edge in the proximity of the end opposite to leg.

The rebating assembly (20, 21) with two-way fitting ensures the underframe stability.

The shiplap groove cutting tools have sleds (57, 67, 58 and 56) which are placed against the guide leg (37) to be guided by the same to produce shiplap grooves (23, 25 and 26).

A sliding bearing (1) is formed in a cylindrical shape by a pair of halved bearings (11, 12).