If you get your hammer on the cotter pin and go tappety tappety tap you will ruin the cotter pin and it won't budge
If you get your hammer on the cotter pin and smash the living fuck out of it it will not be damaged and will come out.
And if you pop the frame on your shoulder and head to your LBS they will do the job for you for not much money. If that LBS is Lock 7 you can have cake and tea while you are waiting.
As a general rule.
If you get your hammer on the cotter pin and go tappety tappety tap you will ruin the cotter pin and it won't budge
If you get your hammer on the cotter pin and smash the living fuck out of it it will not be damaged and will come out.
And if you pop the frame on your shoulder and head to your LBS they will do the job for you for not much money. If that LBS is Lock 7 you can have cake and tea while you are waiting.