I picked up this Angled Finish nailer that is mostly working, but the nail feeder spring seems to have poped out. It seems to be largely intact (and the replacement seems to cost around $4), but I can't for the life of me figure out how to reinstall it correctly. Pictures attached.
They have parts and exploded views for almost every type of major-brand tool on their website; your nailer will be there for sure. Zoom in on the diagrams and you can figure out what goes where and how it works. And scan the part listings for the 'favorite' parts sold for the tool which will tell you what parts wear out or break most often so you can keep an eye on them. 
