i am afraid i managed to take pictures of my worksop 3 years ago and put them in photobucket but nowt since as i cant remember how
anyway it looks exactly as the one in your with the inner washer removed you have around 1/2" protruding
you also have 2 exposed screw holes a few mm from the shaft but not shure if anything is screwed in from the back
the back washer reminds me off a china mans hat with most off the pointed bit removed
the outer edge of the washer is around 2mm then after a short 45% taper itt around 4mm
then a 10 degree ish slop towards the centre makes it 7mm
then the final flair at around 70degrees to 10mm where the centre arbour pokes through
hope that makes sence
http://www.mtmc.co.uk/product.asp?numRe ... D=12705819