Right !
Builder has left cat5 cable with not much length . So for example 30cm hanging down from ceiling - so everything is up a ladder and awkward .
I hate crimping ! So fiddly !
Anyway managed with a tester to know i’ve Got 2 ends of the same wire .
Redone both ends - get missing lights on tester . Is there anyway to know which end is wrong ? . Otherwise I could be here forever !