Weasle, it's held on with the fit over the rim of the lamp itself, no need for the lugs. In most its a good snug fit, though that plastic on plastic does still make that clatter noise when attaching, so add insulation tape either round the rim of the lamp or the filter, only one strip round though, or it'll be too tight and you'll find the noise will stop and the fit is snugger too. On the lug you heat and bend as a handle, you can always add a hole and string it to the lamp at the handle so as you dont loose it, though i don't bother. I'll put some pics up later.
Asha, of that i've no idea,