Powerhorse chipper Northern Tool

Okay, new to forum, I have a Powerhorse chipper, for about a week old,
had to get new blades-knives.  Customer service is great at northern tool, received the
two blades today. Machine model is a a 63389,  knives are a PH63389-14 from
Jacks small engines.  I need. The torque spec’s and any position setting if any.
the knives/blades have a elongated slot, for each bolt.  I am thinking, measure the position 
of the old ones first, and use blue lock tight.  Tighten bolts? Tight.  Any any thoughts?
thanks, Bo,  
found no help on web, utube etc.