I'm probably opening a real can of worms here but................!
I "hear" at a lot of "fshing" boards about cutting a rod blank tip back to gain more casting weight. I'm no "expert",have no degrees,etc. but I think that there is a misconception in that line of thinking. By cutting back the tip the only thing one has"accomplished "is to reduce the low end of the blanks' weight range; ie a blank is rated to cast 3/4 - 3oz.lures; cut 5" from the tip and now it'll only cast 11/2 to 3oz lures effectively. Structurally a blank is engineered to cast a given range of weight and simply cutting the tip changes nothing to increase its "power" to cast heavier weights.
One will shorten the blanks length, change the action, narrow the weight range capability of the blank BUT the"power" capability is NOT increased.
If I'm wrong here please set me "right". Warren

Mostly right.

For example:

You want an 11'6" rod that will cast 'x' ounces. You may not be able to find an 11'6" blank that will do that without collapsing the tip. You can often buy a 12'0" blank and cut 6" off to gain the extra ounces.

Collapsing the tip will decrease accuracy and increase chances of breaking.

You do not really affect the overall 'power' or 'action' of the rod.

Cutting the tip does not make the rod stiffer or stronger. The same stiffness is still there. You just move the rated casting weights up a bit. Unless you change the diameter or the wall thickness the blank is not changed stiffness or strength wise.