The continuity plate fills the void above the working tool but it could be useful to apply the same technique beneath. Therefore the whole thing is about piling a stack of spacers that could come as close as possible to the bottom cutter. Just in case I also machined three independent wood like continuity plates which could be shaped according to need.

In fact one only set of seven spacers allows the thickness of one to eighty, millimetre after millimetre. The black items of the below list show the needed spacers whereas the grey ones can be stacked in a mixed pile.

Here are three ways of building spacers. The one and two millimetres thick could be cut up from aluminium plates and the intermediates may be several thinner ones crimped. Lastly an anodised aluminium extrusion with wood like stuck completes the tallest spacers.

Perhaps you have noticed the holes drilled near each end of the spacers. They purpose extra assembly allowing for unusual contexts. As instance machining a tongue in one pass with the help of the power feed unit and the continuity plate demands the lower spacer to be raised from the table top. Two rods accommodating plastic spacers enables such arrangement. The spacers come from internal phone cable cover and slightly pinches the metal rods so that the assembly could be piled out of the plates grooves of the fence.

Lastly these spacers couldn't be so useful if they didn't store within arm's reach and you may see below that they are put away close to all the spindle moulder accessories. Two small drawers just under the box accommodate the metal rods and and plastic cover shown above.