So, here are a few quick pics of what I did for my son's Tikka over the weekend. I removed the factory pad, and popped out the plastic "frame" in the butt. I wanted a 12.5" LOP, and the flip flops I bought ($0.98 at walmart) were 1/2" thick. So, mark the stock, cut close to the line with a hacksaw, and then evened out with my 12" circular sander.
Here is a look into the stock after this work was complete
Next, I took the plastic frame, previously removed, and trimmed the top and bottom so it would fit in the trimmed stock. I also had to sand the edges of this frame thinner since the trimmed stock is narrower than the factory length stock. Here is the frame after this work is done
Next, cram 3 plastic grocery bags into the butt- this makes a huge improvement to keep the stock from sounding so hollow, and adds essentially no weight. The, a little 5 minute epoxy was added to the sides of the stock and the trimmed frame reinserted.
Next, trim the flip flop to rough size, degrease flip flop and stock, and apply a bit of devcon to the stock edge and frame. Apply the flip flop pad, and tape in place until cured.
The next day, I removed the tape and sanded the pad on my 12" sander. I slightly rounded the edges with a sanding block for the final finish. Not my best work, but for a grand total of like $1.37 in materials and 30-45 minutes of my time, it's not too bad, and a heck of a lot better for my son.