Originally Posted by
zandoval
Also remember that no matter what the manufacturer of the pin they do fit differently and need custom filling with a bastard file to get the angles right...
+10
This is an important step if you want them to stay tight.
If you use the (not recommended) hammer method, you have to whack it pretty hard. - Hard enough so that if you miss you would damage your crank. (Which gets us back to the reason why a hammer is not the recommended tool for tightening cotters).