It is done! For Christmas, my dad, bless him, gave me a voucher for custom-making me a Henderson gold pump. Awesome gift! Since he is a very skilled handyman, I knew it would turn out great (it did - works like a charm). And since it did turn out so great, I made a tutorial for you. Step by step, with photos to lead you through. Hope it helps.
Unfortunately, my panning realms are currently covered in snow and ice. As soon as that has melted a bit, I will put it to the field test, as the water levels are still low, which will enable me to access areas I won't get to in the summer.