Need help with a broken p3 standard gimbal fix

[Munyb]

First post. Flew my p3 standard into a wall the other day and I'm going to attempt to fix myself. After reading suggestions and watching YouTube videos I only have one more question. See the pic: what do I need to attach these two parts? Thanks for your help!

 

[msinger]

They should just push together. You can see it done in the following video: