So I'm trying to install a 1/8 17t EAI cog on a Weinmann DP18, which I believe comes with a formula hub but the damn cog would only go halfway. I know about the different sizing for phil and campy hubs but the thing just won't go in smoothly. I installed a cog from my kilo and it fits perfectly, so I compared both threads on the cogs and it seems the EAI has smaller threads. Do EAI made BSC and ISO cogs? Anybody had the same issue? Should I just force the damn thing? Also all parts are new and threads looks good. I probably need to email Ben's.