Wanted: Sugino 75 - black 165

Are you sure that was a crack?

i'll offer you a bump if i can hijack for a few seconds

at herne hill on friday i was accosted by a fellow forumenger who told me to take a quick look at my sugino 75 on the drive side where the crank arm joins the spider
he said he'd noticed a small crack appearing on his and when i looked at mine it to had a slight ( very slight crack )

i was advised to file out a small section to stop the crack spreading

can anyone offer me any further info / advise / help as to whether this would be a good idea / bad idea