Ive kindof worked out why they have five parts (not four) as its supposed to give strength, and in some instances the brace on the top of the gearbox (the item that slots into the top of the top sections) is rigid and increases the front end strength but the weakness lies in the bottom two parts of the gear box as they have been milled out in the original molding so has basically taken the strength away from the sides. In fact the same for the top two sections but I have not broken as many of those so are good enough as they are. Also the rear gearbox is perfect as it is but I will before the Petit event have new gearbox bits for the bottom (still working on them) and top as well as the rear. These have the milled out areas filled in aiding in strength, as well as the front bottom gearbox end bits being reinforced as if the plate flexes the square screw hole sections snap off.
The kick up plate I may be able to locate one for you but its not going to be cheap. I understand that there is a new one unopened somewhere in Japan and I an currently trying to persuade the chap in question to part with it so will update you when I get him to say yes.
The other alternative is to make a plate, as long as you have the original and is bent just hammer it flat (except for the kick up part) and get an alloy specialist to make one for you. I would seriously think about using steel instead of alloy if you can.
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