Pedals that can not be removed must be replaced in its entirety when they have too much slack, heavy walking,
a tick is in or crooked.
Try not to bend crooked pedals.
By bending the pedal is weakened, resulting in an unacceptable risk of sudden rupture.
Therefore let the maintenance done by a specialist.
For disassembling and reassembling the SPD pedals is usually special tools are needed. With this tool can dismantle the complete axle unit and mounted. After the disassembly of the axle unit the axle unit can be further disassembled. Once again this again requires a special tool.