For those who are interested in the process, I decided to share my experiences so far with caponizing. As told to wisdom_seeker:
Well, I tried it today with the older roosters. The first one I dispatched first, so I didn't have to watch it suffer too much while I dug around in its side, trying to find the right place. There is nothing like experience for a teacher. I was still cutting in the wrong place, and did not see any testicles, so after I made the initial cut with nary a testicle to be seen, I felt around inside the rib cage in order to find out if I was really in between the first and second rib. No, I wasn't since I couldn't actually feel the last rib hardly at all from the outside! So then I made the cut in the proper place. First, too high, I hit kidneys again. I extended it lower, then realized that the membrane I need to tear to see the testicle is actually quite a distance below the cut and the ribs. I didn't expect that! I guess I thought that everything should be much closer to the surface than it really was. I removed the skin in a larger area so that I could more precisely figure out where the initial cut would be in relation to the bones I could feel and the muscle groups, since the cut had to be so close to that first thigh muscle group; if fact, I kind of had to push some thigh muscles out of the way to place the cut accurately.
I practiced again on the other side. Then did it on the live bird. There was more blood than I expected, and since I wasn't working very fast, it tended to obscure vision in the body cavity. Also, I think I need to find a better light source, since I could never get my reading lamp positioned just right to see in the hole, and I kept burning my forehead on the reflector because the light was so close. I had trouble removing the testicles in one piece, and can only hope I got all of it. I used the triangle shaped forceps like you suggested, but if I pressed hard enough to grasp it, the testicle tore, and if I used a lighter touch, the testicle slipped back out. Forget any twisting or clipping, I tore both of them trying to get them out, so I never got them pulled up high enough. Hopefully the bird won't bleed out internally.
The first side on the live bird, I didn't stretch the skin near tight enough before I made the cut, so when I was done, the cut between the ribs was lined up with the cut in the skin, hence a gaping hole was left. Also, I made the first cut too long, closer to 2 inches, so I decide to put in some stitches to close the skin since I just couldn't see leaving that gaping hole. I just used regular needle and thread.
On the second side, I made sure to stretch that skin super tight before cutting, so that worked out better. Also, I was more sure of the placement of the incision, so it wasn't too long. After I removed the stretcher, the skin slid over the hole between the ribs, so I didn't stitch, since that is how I would like to end up doing them.
I noticed that I could see both testicles from the first side, but it was so far down there, that I decided not to try to get the far side one, and did the two incisions. After I practice more, I will definitely be trying to remove both of them from one side, since by the time you find one, the other one seems to be right next to it.
I would really like to have one of those "threaders" the booklet talked about. It seems like that might be better for removing the testicle without breaking it or trying to grab it. If I can find a better picture, I might try to make one.
Thanks for helping me with this. If you think I should, I'll post these details on the capons 2 thread so anyone else who is interested can read about it.
The bird seems to be doing okay right now. He ate and drank and stood up fine when I put him in his recovery cage, then went to sleep. I'm giving him penicillin prophylactic just in case of infection, since I don't trust my needle and thread not to be carrying some sort of germs.
I'll put the next roosters in the isolation box to starve before surgery as soon as I figure out when I can do the next practice session.
Later:
I did do the 2nd session with 3 roosters about 7 weeks old. Of those 3, only one lived. One died on the table when I nicked an artery and he bled out, the other died the next day. Despite those losses, the experience was truly invaluable. The younger roosters are easier to do than the older ones.
Also, I've made a prototype of the Sears "threader" tool, but haven't had a chance to use it yet. I'm waiting for a few more roosters to get a bit older.
I'll keep everyone updated as things progress.