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I'm sorry to hear you have a hen with a crop issue also. I can't think of anything I would have done differently - it all went exceptionally well. I did try everything else first though and only did the surgery as a last resort. God knows, I did NOT want to open up that chicken's crop but I knew that she wouldn't make it much longer if I didn't.
Note that I did drain the fluid out of her first by holding her upside down being careful to keep her head down so that she didn't lift it while vomiting out the putrid black foul-smelling liquid and aspirate on it. That probably got a cup or more of liquid out of her. I think that was important because when I first laid her down to look at her, the liquid started draining out of her mouth and she would have choked on it so I think that may be an important step to try first. You may also be able to get out enough gunk so that you wouldn't have to operate. In my case, it was clear there was still a huge ball of stuff in her that there was no way it was coming out of her mouth. You can see in the pics how large she was and that was after the liquid had been expelled.
In her case, she had gotten really weak so if I had it to do over again I think I would have done it sooner. I first noticed something wrong with her about three weeks prior. She was really "old" looking, all gray around the face and her comb and wattles were colorless. On examination I found she was emaciated and skin and bones and had scaley face mites. I treated her for those and noticed her crop felt hard but it was night so I had no way of knowing how long it had been that way but I knew she was too skinny. I kept an eye on her for the next couple of weeks and finally pulled her from the flock to bring inside and withhold food to watch the crop. When she wasn't pooing and the crop didn't go down after withholding food and it was practically dragging the ground I knew it was impacted. I then began a week of trying the olive oil and massaging but it didn't work either.
So, to answer your question, if you've tried olive oil/massage, and tried the holding upside down, and there is still a large impacted crop after withholding food then I would suggest the surgery. You can get a set of sutures from your vet. I made the incision high on the crop so that it could heal without food weighing on it. I used a new single-edge razor. I stitched crop, skin on outside of crop, and outer skin all separately.
Best of luck. Keep us posted on how it goes.