ORIGINAL: olnico

Jeremy, these straps have proven to be reliable with hundreds of engines.
The new 120SX straps have been improved by the insertion of blind nuts.

To get the proper tightness, just turn the screws till they are all in contact with the straps working in a star pattern. Then add two turns for each screw.
On the first engine run at full thrust, verify that the engine does not slip in the bracket. After the first few flights verify the tightness of the straps when the engine is warm. Then you'll be good for many flights...