Here is the picture that Highbury tried to send. It was too large so I have done a screen copy, pasted it into WORD, copied the WORD image and hopefully it will be below. The grey plastic bushed can be clearly seen.
I don't have one here to compare but it turns out that the difficulty fitting was due to the diameter of the steel tube fouling the top of the RFM between the lugs.
I don't have one here to compare but it turns out that the difficulty fitting was due to the diameter of the steel tube fouling the top of the RFM between the lugs.