Over one month has pass, I have been riding the A7 and have had three experts (never owned an A10) come around telling me how easy it is to fit the standard air filter, they all failed.
So I am making my new rubber connector when the RAC man from my road says what are you doing, I explain and as per the others he says it must be simple (he does not even know what an A10 is). Anyway he persuaded me to try one more time his way, it worked damik (new word thanks muskrat).
So here goes in case anyone else has similar troubles
Fit carb and air filter together off the bike using rubber connector, then put whole unit up to manifold and do up bolts holding carb to head (not to tight). Finally do up fixings that hold air filter to the battery strap and the ski slope engine plate cover.
She ran pretty poorly with the clean air filter but a little tinkering with the air screw solved that had a good road test so she’s back