Read most of the 'strainer' posts

Managed to visualise the description of your 'tool' with the 'back to front' plug sockets -amazing -worth a picture in the archives!!!

Checked my plug sockets........19mm & 22mm heads and my six sided 5/8 plug socket is a useable fit with my 1/2" extension

Unfortunately doesn't look like I need the 22mm allen socket after the fun of putting it together.........looks more like I will need ~45mm tube type socket......the 19mm fuel line connection looks impossible on my w123....no room unless I remove accumulators etc.

May just try the compressed air to confirm the diagnosis...what do you think ?