Decompile a regular crowbar p_ model, align it to the same position as that crowbar in it's reference smd, but you may want to figure out what bone it is rigged to first, and rig your new crowbar to that bone, then you should have a working p_! Just make sure to delete the old crowbar that is in the smd, otherwise you'll have a crowbar inside of a crowbar, and we're not playing Pimp My Crowbar here.