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.
 
 
 

I think your plans to measure and replace in the same spot is fine.
 
Locktite on the screws won't hurt.  Good and tight should be fine, 
(try to repeat how tight they were coming off)..
 
.

I was looking at the sane thing. Is the $121 for one blade or both of them.