th hole where it is supposed to go. what do I do? do I get a new one? and where? can the old one be re-used safely? how would I get it out? how would I put the new one in so it would not leak?so anyway, after I cleaned up the head, I installed new valve seals, cleaned up the valves, and put them in. all except 2. turns out, I was missing a couple retainers. so this morning I got some from a machine