I have known only one drawback with the power feed unit bolted on the table of the combination machine. Parallel cut with stock longer than 600 mm (24") and wider than 185 mm (7") can solely be performed after removing the power feeder. That last weights about 30 kilos (66 lbs) and has to be removed in two 15 kilos (33 lbs) elements unscrewing four bolts between the two components. Not really a pleasure as you may guess and I knew the feed unit falling on the sliding table that left a deep mark. It was the last straw and I spent much time to find out another way of parallel sawing with the power feeder on the table.
I started experiencing parallel cuts using booth the scaled fence and the mitre gauge and got the idea that a scaled extension flush to the sliding table with an adjustable stop would fill about eighty percent of my needs. I also wanted a tool-free lock and release as well as a small device that could be put away close to the combination machine. The following scaled extension may help parallel panels to be accurately cut up to 1550 mm (61") in length and 850 mm (33") in width on the wagon carriage.

The scaled side extension is made up of three main components : the base, the slider and the fastener. The base is merely a box with stuck finger joints and a rebated top so that further improving the strength. Back is 16 mm ( 5/8" ) thick whereas sides and front are 7 mm ( 1/4" ) and top about 10 mm ( 3/8" ) after truing with the sanding disk on the spindle moulder. Two slotted head screws aim to firmly lock the slider against the top and the cantilever, only drawn in the below picture and made of three elements, helps for the support of the slider without sticking out the accessory. Lastly a scaled ruler stuck on the grooved top allows fine adjustment.

The telescopic slider consists of two parts. The flat plate of wood, about 10 mm ( 3/8" ) thick, slides along the base sides and holds the gauge lock. Gauges has been designed as disposable elements 30x19 mm ( 1"1/4x6/8" ) and screwing the knob pinches the bottom gauge against the abrasive strip stuck on the spacer that compensate the base top thickness. That spacer has slightly been bevelled and tightening the knob tends to lean the gauge on the base. The accessory shown in the bottom right corner of the below photo rides the base and the gauge together and prevents the gauge from any lateral move that would inevitably lead to damage the slider. Lastly the small aluminium U with its knob sits at any point and allows the gauge to be quickly removed and replaced at the previous location.

The accessory locks on the side dovetailed groove with two strips and their knobs that came with the machine. I reused a five millimetre thick aluminium plate that proved not enough strong to support the overhand and I had to screw a metal bar behind. That strengthener turned out useful and held two angled plastic pads preventing the dovetailed strips from rotating when locking and releasing the scaled side extension. Of course this could easily be simplified by cutting the rear metal bar at the right length. The washer between the aluminium plate and the dovetailed strip aimed the same purpose.

Storage was part of the design and you may see below where the scaled side extension hangs when not used, close to the mitre gauge.