Yes drill it out....1 Face the bolt,perfect centre punch. cobalt drills if you got em,if not HSS is fine,just go nice and slow with lots of lube.Step up your drills a good tapping compound,easy out if you have one. then retap. 1/4 UNC 20. 2 Heat the alloy with a torch,not the bolt,a few hits with a hammer quench and repeat 3 times or so. if the undeside is poking through see if you can vice it out after you have heated it..note if your going to drill it dont use the heat option as it will harden the bolt,making it near impossible to drill with HSS...if its only one bolt go for it..YOU CAN DOO IT! if its more than one,like another base I saw here,then just get another base,should be around 20.00 and save you a heap of time...OR i can post you my hands and they can do it for you....lols
