Some pictures from my pulley collection. From left to right. EC 61.9mm, Karmen 62mm and MB OEM.
The Karmen pulley is a replacement for my failed pulley. I do feel a slight recess of the rivets but it is less than the EC and OEM. Is it enough? My other concern is the space around the rivets. There is non around the rivets on the Karmen pulley and there is a visible space around on the EC and the OEM. Is this space around rivets needed for any expansion of the metal? Can the lack of space around the rivets compounded with the fact that they are not recessed far enough away from the clutch plate cause excessive heat and premature failure?