Bought a 16" thumb off of Ebay for $200 shipped. I could have gotten a different one a bit cheaper (~$38 or so), but this seller was highly rated. It is extremely well built. Really over built for what I need. The base is 1/2" steel and heavy. I mounted it such that it works best with both the new, larger bucket and the original PT buck. Pics are with the new HF bucket and shown in the different positions. I will most likely leave the base only when not using the thumb to avoid the added weight. The "pins" are enormous, and definitely will not the weak point. Picked up an old railroad tie and large rock as test, worked really well.