Just letting you all know that the standard rear MC of a tonti with linked brakes can use the top of an Old El Paso Taco Sauce jar.
If you want to pressure bleed the brakes, cut a rubber gasket to fit for a seal.
Drill a hole in the lid and insert the appropriate air valve/nozzle you wish to use. Ensure it is well supported by washers and a firm nut as the lid is only thin.
Only use a couple of psi otherwise expect a shower of brake fluid.
This is true for any lid you may find.