yep that is what it is. I have not heard to them reffered to as single or double purchase. I always thought it was called stages. That would be a double drum single stage in my uneducated vocabulary. But I do understand what they mean and the nature of the discussion which was not the same thing I was explaining.
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now on that the crank handles are attached to the same shaft on which both pinion gears are located. Does that mean that both drums are turned at the same time always? or is there some way i can’t see to disengage the pinion from its big gear so that only one or the other or both can be run.
it looks to me like the crank can be moved horizontally to select which drum you want to turn. Engaging only one pinion at a time
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and here maybe the really dumb question but your derrick only has one line running through multiple blocks (to can purchase power) and then to the hook. Why are you making a double drum winch? where does the second line go?
Never mind Answered my own question. One raises and lowered the boom and the other lifts the load. Just like a crane.
I was thinking boom elevation was fixed on these but it does make sense to be able to raise and lower the boom to move the load closer or further from the pivot.
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You would be correct, Devon
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Re the lines, yep, you got it.
About the winch: the center crank bar slides to one of at least 2 positions (a third position is when neither drums are engaged by their respective pinion gears). [edit: just saw that Dan answered this while I was being long-winded.]
In the catalog drawing, the crank is engaging the upper drum’s gear, and the lower drum isn’t turning.
To switch between the drums, you have to carefully apply the upper pawl to catch the upper drum’s gear. Then let off the crank tension, and slide the crank shaft over so that the lower drum’s pinion engages. Then carefully apply tension to the crank, to lift away the lower drum’s pawl. And then haul away.
All the while hoping your helper on the other side (that’s why it’s a 2-crank shaft) doesn’t sneeze while holding the load while you’re setting the pawl back in, haha!
Very OSHA-Not! Machines like these are probably why most of us have a person somewhere on our family tree nicknamed “stumpy.”
OK, I’m officially done with this build. I’d thought I was done last week, but after learning I had another week available, I decided to add the winch (or “crab”), which was glaringly absent.
Here’s the winch, just assembled this morning.
And the thing installed. I guess these are my final entry shots.
Good luck everyone in finishing up, and cheers,
Cliff
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Great model Cliff. Best of luck.
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Cliff, I have to say, I really enjoy watching your models come to life. A true craftsman at work. Ya done good 
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Fine work, master Cliff. Appropriately messy and weathered and fantastic detail as always.
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Thanks very much, Doc! And thanks for staying out of the competition this year!
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Very kind words Dan, you’re always so encouraging. Thanks very much.
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Jim, thanks for posting, and for your generous comments. I was worried about whether you’d still think it was too neat, so I had you in mind while trying to avoid that, and am now relieved, haha!
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Glad to help out. Ha Ha. I’ve never entered this competition because I’m such a damn slow modeler. I’d never finish.
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man that just came out fantastic
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Thanks very much, Devon.
Cliff & Others;
Don’t overlook the guts from HO crane cars as a source for hand derricks. They usually look fairly credible. I’d post pictures of mine, but not sure how I do that in this new system.
Best, David Meashey
Nice tip, Dave.
For photos, you can just drag n drop from your computer (or online album I think). I open the folder with Windows Explorer, and drag the pic right into this editing box.
