2mths

Feel free to shoot me for this expecially if I'm teaching grandma to suck eggs etc...

But you are pushing to down hard enough aren't you?

It takes quite a lot of force to actually get it to clip on properly and of course it's a bugger to get to.

Also you have it lined up correctly? There is an arrow on the cap to show the orientation - if you've not got it lined up properly then I'd expect that to cause fitting problems. Again this is easy to get wrong because of the limited access.

I've had much experiance of taking the plug cap off and putting it back on again - though my Fenda Extenda arrived today so I'm hoping that those experiances might become a thing of the past.