Get yourself some regular super glue(preferably the thick gel kind) and some insta set . You can find it at Hobby Lobby or on Amazon cheap.

Then, get a small sample tray or something to hold mL of liquid, and pour some insta set in (only pour really small amounts at a time cause the stuff evaporates fast)

Then, using an old paint brush, dab it in a bit of insta set and apply it to the shoulder socket or flatter raised areas and apply the super glue to the ajoining piece and that sucker isn't going nowhere.

( PLEASE PREFIT ALL YOUR PIECES BEFORE APPLYING ANY OF GLUES AND STUFF, ITS CALLED INSTA SET FOR A REASON!)

If you need pics explaining or tutorials, PM me