raden wrote:

You can buy the heads separately, or if you're feeling adventurous,
replace the (probably) middle microswitch which will prolly cost under £2

Do you know where the microswitched are obtainable from? I replaced a 2
port Danfoss valve recently because the switch was faulty (it had fallen
apart inside - maybe the OP has the same problem). I've bought several
synchron motors but can't find a source for the switch (it has a long arm).