21-09-2015, 10:22 AM
my 2p'th tip,
rather than using a big spanner to undo the top, I use a webbing strap-wrench.
once it's pulled tight against the cap, it rotates fairly well.
likewise for doing up again.
rather than using a big spanner to undo the top, I use a webbing strap-wrench.
once it's pulled tight against the cap, it rotates fairly well.
likewise for doing up again.
It goes, it stops (as reqd). 
Hate Housework!

Hate Housework!