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Hi. I've been working on my Kommando Warboss inspired by the Kommando from Dawn of War 2.
He's mostly complete however with the bottom barrel of his twin linked shoota being slightly askew.

I had to dremel the hand off of a shoota Nob and afix it to the twin linked shoota from a plastic warboss kit.
However after trying to place the barrel back on in front of the hand its oriented slightly askew. I'd like to fix this with greenstuff.

If anyone has experience with greenstuffing cylinders/ barrels I'd love advice. I have silicon shaping tools and I'm confident I can hack it,
but if there are tricks to cylinders that an experienced sculptor could teach me I'd feel a lot better about it.

Use tubular plasticard. Get the right width for your needs, cut to length and glue it on.

Plasticard isn't a solution that I'm looking for. I need to re-center a barrel to be more in line with the main barrel...without prying it off and moving it. So greenstuff oriented sculpting help.

Are you talking about making a new barrel out of greenstuff? That's going to be putty 101.

Roll out a spaghetti noodle of green stuff to the desired diameter and cut it to the desired length. Leave it to dry and then shave the ends to a smooth point. If you need some muzzle holes, use a small hand drill to drill the holes to the desired diameter.

I'm talking about adding putty to an existing barrel but changing the center to be away from the center to re-align it with another barrel.

I can't quite picture your problem. Any chance of a pic?

I need to make a moon. so I've got a little circle of plastic and I need to make a moon around it that extends the center to a different point...that point being one that aligns with another barrel above it.

I don't have software for my webcam that allows me to take still pictures. I'm on windows 7 if you have a suggestion.

I think I understand your issue. The bottom barrel is a teeny bit askew of the top...is it still in line down the length? Just slightly to the side? If that is the case the only solution i see is to increase the size of the bottom Barrel" so that it now aligns with the top. Smoothing a cylinder in GS is super duper hard. One of the hardest things I think. The secret will be to set it where you want, get your rough shape, and then let it harden a bit (say another 20 minutes) then try and smooth it. You get sharper and smoother surfaces the close the GS is to being set.
If the bottom barrel is at an angle to the top, the same process could work, but it becomes a matter of how big a diameter does the bottom need to somehow re-align with the top. (If your top barrel is much larger than the bottom, then it is far more doable) The straw, or Q-tip, or even bit replacement is my usual option.
I wish you luck. This is not something I would try, and although not a pro, I do a lot of GS work (see my gallery).

Alright I took a shot and sculpted it. Thanks for the advice I didn't really find anything that applied. I don't think I'll need sand paper but I might use it if I need to flatten part of the barrel.

The trick to cylinders is basically that no one tries to sculpt cylinders, lol.

If I had to do it I'd probably use milliput over GS, but it's probably not going to make a hell of a lot of difference.

I'm not sure I understand your problem fully, I feel like my solution would be to hack off the part you stuck on askew and reattach it in the correct orientation.

I had a tough problem. Either make the barrel slightly larger to align it with the top barrel or scrape the piece off grind off more and then put it back on and align it correctly.

Ultimately I had to sculpt something. Either I had to remove a portion of a hand (out of my capabilities to sculpt) or to sculpt the existing cylinder to be larger re-centering it or I had to scrape off the piece and sculpt back around it and the hand. If it would even stick after already having been glued once.

I think I picked the right solution and hopefully the result will be appealing to viewers.