The problem is access to the four 1/4 key hollow screw, so I would like to change the fixing of the four Allen screws by replacing them with another fixing system.
Excused me if the drawing is rude.







There are nuts with hexagon socket reduced by 8.125 mm with a 10 mm wrench, as well as ratchet wrenches




I would look at the possibilities at the next disassembly I do not have time to design and manufacture a new steel welding casing.

The easiest for me would be to make four opening on the torque damper housing for arrived at passing the key.