Removing cap from Bullseye LNB

Hiya

I have a bullseye lnb that I plan to use for a QO-100 transceiver setup.
How do I remove the red end-cap from the lnb to allow me to drill a hole for the
poty antenna?

I have tried to gently prise it off unsuccessfully - obviously I don’t want to damage it.

I probably need to use more force but want to check before I do this.

Cheers

Steve

I did remove the red cap from one in the past, as far as i remember it was just more force :slight_smile: