After installing my new rear sprocket today I managed to break off one of my chain tensioning bolts. I drilled it out and tapped new threads. I am embarrassed to ask but what are the bolts made of? Plain steel, stainless steel or other? I know they go into the aluminum swingarm? I am off to the local hardware store to buy new ones and want to make sure I purchase the right ones. I am no mechanic but the pleasure get out of doing these minor repairs is tremendous.