put masking tape over the plastic bro,,were your gonna drill with paddle bit,,it will cut smother edge and when it starts to beak threw it wont grab the plastic and run if you dig ,,same as aluminum tape keeps a crisp cut hole,,on that plastic bits got to be sharp,,i have a better way,,if you want to try it,,drill a hole as big as you can with reg bits and then finish hole with a dremel tool,,is this for your trimmer?if so get a cheap as wally world tote drill a hole in each side ,,put lid on and hit that drill full blast,,lmao only place it will come out is the 2 holes for your all thread