Regular old glue stick. Preferrably a high temperature stick. Melt a bit add it in the tip top and stick it on the tip. Peel the excess off with your fingernail and you are good to go.
Many of us custom builders use the glue stick. Easy to install and easy to remove if you align it wrong.
If you want, you can send it to me and I'll repair it for the cost of shipping. It's a 5 minute job