I bought a Festool guided saw, to process sheet goods. It comes with 1400 mm (55") guide. That's insufficient to cut the length of a sheet of plywood. Festool offers two possible solutions: a 2700 mm (106") one-piece guide; or joiner bars which connect the 1400 mm guide to another 1400 mm guide. The joiner bars solution is considerably less expensive, so I tried that. Unfortunately, it does not work well. The joiner bars slip in the guide extrusions, so the 1400+1400 mm guide does not stay straight. I honked on those screws until the extrusions bulged, but could not keep the joined guide straight.
I finally gave up and bought the 2700 mm guide. Anybody want a slightly used 1400 mm guide?