[JayJay]

Originally Posted by History

I was going to say that adding a rubber washer should help on vibration some. I remember another thread here about attaching the pans and som one tapped the holes on the frame and could just screw in bolts from underneath while you’re already there, no need for third hand. You can always use nut and bolt even with this method if it’s a points car. I plan on doing this myself.

Think about this a bit. The existing holes are clearance holes. If you thread them then you'll have to use larger bolts and nuts, which would not do well on a points car...