There are two reasons why I would change or modify a lure; one, to change the presentation by changing the color or action of the lure, and two, to correct a manufacturer's defect. By changing the color, action, or sound a lure makes, one is able to take a standard lure and change it to fit their needs and applications. With regards to correcting a manufacturer's defect, I am talking about fixing a bait so it will run true with the correct "wobble" or action. Most baits are just fine out of the box, but sometimes they need a little "tweaking" in order for them to perform most effectively.
Below are a few examples of some basic lure modifications that I use to modify my lure presentations.
1.) Trimming the skirt and weedguard on my jigs. I typically thin out the standard weedguard by cutting about half of the guard off. There is still protection left to ward off weeds, and the thin guard allows for better hooksets in my opinion. I will also shorten the skirt to about even with the bottom of the hook. This will create a smaller profile so when the fish attacks the bait, they will most likely strike the hook instead of the excess skirt.
2.) Add a rattle inside a floating frog. When I bring a frog across an area thick with lily pads, I sometimes like to add a rattle to add more sound so the fish can locate the frog easier. I will use a small rattle that can be bought at a tackle shop and insert it into the frog where the hooks pertrude.
3.) Use dye to add color to my plastics, jig skirts, and crankbaits. Sometimes just adding a bit of color to the tail or end of the skirt will entice more bites. There are many different ways to apply color. There are dyes that worms and skirts can be dipped in, paint to be used with a brush, or markers that will work just as well.
These are just a few simples modifications to try. It is said that bass can become conditioned to the same lures being thrown over and over, so trying a few easy changes can potentially put more bass in your boat and a more enjoyable time on the water.