omahahaha

Hello. I just registered with this forum for help. I'm not a train enthusiast but my 4yr old son is so here I am. I bought the Penn Flyer set new at a Big Lots when he was 2 and didn't open it because he may have destroyed it then. I open it now and the battery contacts in the coal tender car are missing. I haven't had any luck with an internet search for the part(s) but maybe I'm searching the wrong terms. Does anyone. have information about this part or if you have a similar tender car, could you post a picture of the inside? Maybe i can make something that will work but right now I have no idea what it looks like. Thanks!