Hi Oz, it's the biggest pick made by Dave Dench - forum member Davsgold. I think a few shops stock them now, Central West does. Best pick I've ever owned.
Usually I start my holes bigger from the get go which saves having to widen them later on. This was in a compacted wash area and the sediment that was holding it all together was like cement until you got it out then it crumbled.
In the end I was laying on my guts with my arm at full length stabbing away with a screw driver then scooping out the rocks and dirt with a plastic bottle fashioned into a scoop.