I would like to know . I got a 1/2 dove tail machine from harbor freight. I’m trying to make blind 1/2 dovetails . My problem is everything I read says to use a 1/2 dovetail and a 7/16 guide bushing then from the top of router bit to the router base should be set at 9/16. I can’t get the 9/16 because ID on the bushing hits the 1/2 router bit . This is my second time to buy bushing.