You try a 17mm 6 point socket?
Yeah it just slips offYou try a 17mm 6 point socket?
Yep ended up taking a chisel to 3 of 4 of them, thanks for the adviceI use a chisel and hammer to cut a notch and in the edge of the cap and then tap it free. Vice grips will also work. A new cap is needed in both cases.