Just to give you an idea what i was chatting about earlier, here's the sun shield in my Arai lid.
Also i just spent an hour putting new 1mm thick double sided tape onto my anti fog insert, and i didn't do a bad job even if i say so myself.
It's now airtight (didn't even need any glue at the join this time) and it will last about 3 winters before i'll need to do it again. I have another tinted insert on another visor for the summer season.
NOTE: Just for info sake, when you take off the old double sided tape it will always leave a tacky residue behind on the visor, and on the insert.
To remove this i had a bottle of "Sticky Stuff Remover" (yep, that's what it's called) which dissolves the sticky leftovers but is totally safe on plastics. Then i just cleaned again with a small drop of washing up liquid and thoroughly dried and cleaned each surface before sticking together again.
You REALLY want a dust and hair free environment to do this because as soon as the double sided touches the visor you CANNOT adjust it, TRUST ME.
And the last thing you want is a dog or cat hair or a spec of dirt sitting in your line of sight for the next few years!
http://www.amazon.co.uk/Mykal-Sticky-Stuff-Remover-250ml/dp/B000TAT4GM