i tried to take the pivot bolt on the swing arm out today.The manual says to take the nut off and slide it out.The problem is itwont budge.Is there a retainer or something?i Hit the bolt with a dead blow for about 15mins and it didnt even move .am i missing something here,or is it just coroded in? it moves freely up and down {the swing arm}but the bolt dont.please help. its a 96 cr125.