The headlight switch knob shaft won’t stay in?

I think my headlight switch might be broken, the shaft won’t stay in. How can I get this shaft seated? I can’t get the switch knob to engage the switch. The bezel is screwed in all the way. I removed the knob and dash bezel to paint the dash. Now I cant get the knob to click in. It just pulls out. Is there a trick to try? I did remove the bezel and was able to insert the knob without the bezel and it locked in. Any ideas? It’s a 68 with the vacuum lines on the switch.
Thanks,
Ric in Cali

They can sometimes be tough to get them to snap in place. Like it says, rotate while pushing.
Headlight switch.jpg

Royce,
Thank you that worked. Pushed it in all the way and turning it snapped in. Woah!!!
Thanks
Ric