Um...what??
Remember you are talking to a complete idiot here - I haven't a clue what you just said!!
You might as well have told me in Russian!!
Can you explain for me please?
Look at your bass or your guitar. Same concept on truss rods either way since they both have them. Bet you got some allen wrenches with that bass huh?
The strings attach to the bridge and the headstock. The strings are tuned to pitch and the tension of the strings pulls the headstock and the bridge towards each other. The thing that is weakest that has to resist and withstand the force is the neck.
See below the amount of tension in kg tuned up for a set of bass strings. Not quite as high tension as the SH set though. All total 81.5 Kilograms of force against the wood of the neck.
G 20.73 kg
D 23.58 kg
A 19.82 kg
E 17.41 kg
Wood cut thin like a guitar or bass neck would eventually warp under such stress.
Built into the neck is a counter force to help the wood and it is the truss rod. Every guitar or bass has one an the adjustment could be at the headstock like yours or the heel of the neck where it connects to the body.
This is turned to apply enough counter force in the neck to set correctly for what is referred to as "relief". The neck will be slightly concave, as in a little dip in it, if you look straight down from the headstock.
When you change string makes, brands, etc they may have different tensions so the counterforce for the old set may be too much or too little for the new set.
The Steve Harris string set is very high tension and you will probably see a greater dip in your neck than it originally had. The action will get higher due to the shift. No big thing, it just would need the rod tightened.
If it gets convex and bows upward you need to looses the rod so the string tension pulls it back to the proper position
This is part of what you pay a guitar tech to do is adjust this stuff. Once adjusted in to your usual set of strings you may have to tweak it a couple of times a year depending on the seasonal conditions making the wood shift.
Usually a 1/4 or less turn of the rod will suffice for a seasonal adjustment. Turn, wait 24 hours for it to settle, and adjust again if needed.
I think the SH set needed about a 1/2 turn on my bass when I put them on.
Cornfrused?
Learning how to do a "set up" will save you in the long run so you don't run it to a tech and pay all the time for something you can handle at home.
Jim
Such a change from my old bass which was so heavy and really hard to play.
