Transe, Bj 92 – reverse gear does not go in (after coupling exchange)

Servus am Friday with my Transe (Ford Nugget) direction cote d’azur Francet. On the AB he unfortunately disassembled the clutch :-/ ADAC towed me to my home workshop and and and … The clutch was made but now the reverse gear is no longer going in, but all other gears go in, waruuuuuuum ? My primary question is now, who knows a solution for the reverse problem ????? Actually the gearbox can not have taken any damage since the bell yes to i I would like to deal here mainly only with the question, what the problem with the gear can be, since the workshop which has built this is an old friend and I do not want to blame him for having done something wrong as a car master. The gearbox is the, without switching rods, the gear lever goes directly into the gear. We have also removed the gear and tried to get the gear in with a screwdriver. The forks (as I think the things are going into the corridors) are all in the middle (so for 1 and 2 , for 3 and 4 ) except the fork for 5th and reverse, that looks almost as if there was a piece out there, or is the fork built something different ? Because if I have the fork here m al anschaue , then the yes also this Nut has above http://www.ebay.de/…/181075272617?… It is a shemale, Bj 91/92 , 2,5D – villt someone advice ? The workshop unfortunately does not know any further ! 🙁 Achja, villt einer still knows the transmission key letters for the vehicle ? Ford car house has no more data about the car and needs this for the search for nem gear if all ropes tear. Until then ….