https://www.summitracing.com/parts/...9pVWl4SM2TC55u8RJxR_dqQpn58B65BXn4aAomD8P8HAQ use this tool all the time. Tap threads in easily, put the steel insert in, expand the top with the tool, blow out the hole, start engine for a few seconds with the plug out to blast out a few shavings and presto....its done. half hour at max