Just had a friend round who builds Traction engines for a hobby and sells them on (he has a nice Legere too). He noticed a piece missing on the top of the crankcase that centres the head gasket.
I checked up on the piece and it seems to be 730007
[attachment=0:33cow9qr]blcok.jpg[/attachment:33cow9qr]
typed it into the cas-shop.nl website and it is Pied de centrage de culasse 730007
[attachment=1:33cow9qr]730007.jpg[/attachment:33cow9qr]
Which looks exactly like the only piece that I could not identify above….. 😀