Reich swivel mixer tap

[pastiche]

It is driving me up the wall, my kitchen tap has locked into the hot position and I cannot find how to free it. It is the type which folds down into a recess in the sink. Reading the owners manuel which is nothing like we have. I remove the two small red/blue inserts in the tap, unscrew the tap from body, lift out the small nylon block which has a thread in it, then cannot see any other part to get at. Any help will be appreciated.

 

[Dustydog]

Are you sure the cold water system is functioning correctly?

 

[pastiche]

It is the tap which will not turn to the cold position, something is locked up inside.