I have some black metal tube from a standard lamp we got as a wedding present ( but was falling appart ) to use as my indicator tube.
Got some mesh free, an ex-colleauge and freind whos parents now live across the road found it unused and as said freind now lives in Vienna they gave it to me
when clearing his stuff out
I may make a bit more progress. over the comming months ( Possibly )
Nose looks spot on Dave..
TT