3rz timing chain tensioner install problems

Currently doing my first engine rebuild. I am trying to install the chain tensioner and it will not go into the head. I have it in the correct way and it is the original tensioner so I assumed it would go in easy. In order to get it in I will need to use a hammer but am a bit hesitant as I don’t want to strip the teeth on the tensioner hammering it in. Are they all this damn tight? Did the machine shop give me a different head by accident? Am I just being a fat pussy and need to send her home? Thanks for any input.

 

I just did mine a week ago, i didn't notice any friction whatsoever.

How does it sit in the original head?

 

Did you watch this video? Around 4 minutes..
I watched that video before installing mine and answered all my questions

 

Looks like you left the link off. Here is the one I followed when I replaced the gasket on mine.
https://www.youtube.com/watch?v=lJ812DijbNw&t=162s

 

Oops, that's the exact video I was gonna post.

 

I watched that video a few times it didn’t really help my problem here are a few pics for reference. Maybe you guys will be able to see if I messed something up

 

Update: I threw the tensioner in the freezer and was able to barely squeeze it in by hand. I’m still confused why it was so hard in the first place.