Looking through the hole in the mainspring housing, there is a little bump in the middle. I see that in the MSH pin itself there is a groove where this dimple sits. The problem is, I am trying to push the pin through the hole and this bump/outward dimple won't allow the pin to pass. It is even scratching the pin badly. Is there sometime I'm supposed to do to make this thing go away so I can put the pin in? Or am I just supposed to apply more force?