Fault found, part ordered, just need to wait for it to arrive. Although it was egay, so probably the wrong bit will turn up weeks late.
Needless to say, the oppsing part didn't turn up today, despite ordering Saturday, and the listing claiming it would be posted same day if before 2pm (so posted Monday) and I paid next day.
oppswit oppsing ebay oppsing sellers. I oppsing hate them. oppsing retards, universally.