Removal of handle bar end plugs

I unscrewed the centre screw loosened my lock on grips as I want to swop my break leaver and gear changer over but can't budge the plastic plug on the end. Is it screwed into the bar or just bashed into it? Well got it removed. Partly removed screw then tapped it in. Then prized off the plug. Thanks to a very good Mtb friend. I owe you a beverage Sat.