Hi I have been using an old Blomford Turner topper however it has acquired an oil leak from the gearbox. This due to a collar coming lose and putting lateral forces on the oil seals.I contacted BlomFord who are still going but the unit is obsolate to them now. Tha gearbox was manufactured bu Hi Ton transmissions who no longer exist. The oil seals should be okay but a small repair is required ( collar). Any recomendations for gearbox repairers ?