Terminal attachments for ballast connections.

[AmateurRamen]

I'm a newbie to electrical DIY. There are some connectors on a ballast that I'm not familiar with. The cable I have is an 18awg 300v with wire cores made up of multiple thread copper. I cannot get the copper into these ports so I need some sort of terminal connector. Does anyone have familiarity with these style ports to recommend an appropriate male counterpart?

Thank you in advance.

 

[James]

Small flat screwdriver pushed firmly into rectangular slot, opens up the internal cable clamp.
push in cable, pull out driver.

 

[AmateurRamen]

Small flat screwdriver pushed firmly into rectangular slot, opens up the internal cable clamp.
push in cable, pull out driver.

Thank you for the reply. I was thinking this was the case, but it's being troublesome. I'm also concerned at the long term reliability of a direct connection, if I get it to do so. Is there a connector to make this connection solid/easier/more durable? I've seen a lot of crimp style ends to use. Will any of the pin style ends work well for this?