: we have a shower stall unit. it has separate handles for hot and cold. we are in the process or trying to remove the cold
: handle and stem. we are having trouble reaching the seat and need some help.

Louise,
Removal of the "bonnet" nut will not be enough. The entire stem will need to be removed, which has flats for a deep socket wrench further back, behind the tile in most cases. You may need to chip a bit of tile to get the it. Terry