The engineering for the rail connectors must have been done by some other company. Why can't Festool or some aftermarket company manufacture a decent option for this? The existing connectors are sloppy, require torquing the screws to the point of rail damage, are far too short, have too few grub screws, are easily bumped out of alignment. This isn't rocket science. I know other companies have talked about selling better connectors but I am unaware of any making it to market.
I have no storage room for a full length rail and have no other choice but to connect two rails. I use the Betterley gizmo to help but the connectors are too short and after multiple attachments the grub screws have deformed the rails to the point of causing deflection when tightened. Really ticks me off that this has not been addressed after all these years!
I realize Festool wants to only sell accessories that fit in a Systainers so limiting length but since you still have the long rails to transport there is no reason that the connectors couldn't be at least the length of the shorter rails.