While chaging the oil for the first time on my Coolster 110cc atv I removed the smaller hex bolt instead of the larger one to drain the oil. When I removed the smaller bolt a spring came out and then a small metal shaft with holes in it. the shaft has a plastic tip on the one end and I'm not sure how it goes back in. could you please help me with this problem?

 

camshaft tensioner/timing chain tensioner? something like that. yeah, hopefully you can get it back in there without too much future trouble.