Picking up a HF 2.5 engine yesterday I thought I should finally break down and buy a chain breaker. Picked this one up as I had just read how they work fine. (I am starting to laugh when ever I read; "I read") - Harbor Freight Tools - Quality Tools at the Lowest Prices
Very stought piece of hardware but is rated for #420 chain and push pin would hang up inside link of chain. I tried sanding it down as it was very close but was not right and still a pain. This morning I removed the pin and replaced it with a nail with the point cut off. I used a nut as an inside washer and works great.
So for the price of $14.99 and a nail, have a pretty robust and working chain breaker. Pics are carp cam, (cell phone) sorry