User Manual

19
1
2
3
4
5
The Undercover Jig (1) is supplied with every-
thing you need – apart from the power drill and a
small screw clamp for clamping the drill guide to
the workpiece – to create a concealed screw as-
sembly. The matching step drill bit with depth
stop (3) and the extended bit attachment (4) for
conveniently screwing the joint are all included.
The Undercover Jig can therefore be used im-
mediately by every home craftsman who has a
power drill or a portable electric drill. Almost any
wood and almost any board material can be
joined with the drill guide. We recommend the
following screw sizes, depending on the thick-
ness of the wood:
For repair work (e.g. fixing cupboard shelves
firmly to the side walls again, see p. 22), the
screws should be 5 mm longer.
Wood thickness Screw size
from 12 mm 4 x 25 mm
from 19 mm 4 x 30 mm
from 27 mm 4 x 40 mm
from 38 mm 4 x 60 mm
The Undercover Jig
The whole sequence in just three steps
1. Measure the thickness
of the wood
The Undercover Jig can be
preset to various wood thick-
nesses. The thickness of the
wood parts to be joined should
therefore first be measured
with the scale on the side of
the Undercover Jig.
2. Set the thickness
of the wood
The scale on the other side of
the Undercover Jig shows the
different wood thickness of 12,
19, 27 and 38 mm. By pressing
the release knob, you can slide
the bush – to one of these va-
lues and engage it.
3. Set drilling depth
Turn the Undercover Jig over
and insert the drill deep into the
right drill bush, such that the
edge of the second, larger drill
step (red arrow) meets the
mark for the required wood
thickness. The drilling depth is
firmly set at this position with
the depth stop.
Undercover jigThe drill guide
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