Hold on before ordering those pins. I don’t think anything goes in that hole. It looks like the train is either built up incorrectly or that your levers are in the wrong place. Not sure though as I don’t have any pics down here with me or access to a movement. Let me check online to see if I can dig up some links to some setting up info or pics that might be of help. Just didn’t want you ordering anything or putting anything in that hole just yet.
Be back in a bit,