..............I was going to try this mod.Had instructions to hand all nice and sharp drill bits ready, but foiled at the first hurdle.
Started undoing the bolts around the cap....all going well until I got to the last one (typical).The last bolt loosened but did not come out - just kept turning.It did tighten up again when I thought better of going any further.
I am sure someone will suggest a nice and easy solution in order for me to enjoy the extra milage this mod offers !!!!
Thanks and Merry Xmas Steve