D be careful when doing/undoing the bleed screw on the radiator, being plastic it is easy to strip the thread or round the head off.
So DON'T use a shifter (adjustable  spanner) actually you should never use these stupid contraptions anyway.,,,,,,,Woe betide any apprentice of mine who was caught with one of these instruments of Satan in their position! They would come back from lunch to find the horrid thing brazed to their tool box, it would have to remain there for the rest of their time as an apprentice, as a reminder to always use the correct tool for the job!
 

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