So I tried this for the first time about 2 weeks ago. Unfortunately, it did not turn out as well as I was hoping. I used 3.5g of bud, 2.7g of stem, and 2.4g of duff.
The first problem I had was when I did the pre-bake I did it for 5 minutes at 300, but I put it on the top rack in the oven. So it was too close to the electric heating element and it came out darker than the duff I used. Also a cloud of vapor about the size of a loaf of bread came out when I opened it up. I decided to keep going with it anyways and did the same with the stems after I ground them up. I put it on a lower rack and it came out just right (at least I think so).
So I added it to a bell jar with about 4 oz of 151. I didn't use a double boiler though. I used a steamer insert in the pot I cooked it in to keep it off the bottom. Although it was still really hot because the steamer insert was sitting on the bottom. So I think I had it way too high a temp because of this.
I let it cook for about 10 minutes before I looked at it, and boy was it boiling. Probably only an oz of 151 left in it. So I took it out, let it cool a bit, and added more 151. Lowered the temp and went back to it. At one point I put the lid on tight and shook it. Turned out it wasn't on tight and It sprayed all over me the the kitchen counter. Let it go for about 1.5 hrs I think and then strained it using cheese cloth and a garlic press. I didn't think it would work so I didn't use gloves and absorbed a lot through my skin. I ended up with about 1.5 oz.
I then started a second extraction with another 4 oz of 151 and went to my room to watch tv for about 45 minutes. Fast forward 4 hours... I wake up with a horrible weed hangover and stumble to the kitchen. As far as I could tell the material was damp but there was no 151 visible. So I decided I was done and threw out what was left.
From what I could tell it does work although it only lasts about 1.5 hrs for me. With a dose of about 20 drops. I gave my friends about 5 drops under their tongues and it got them high, but I don't think there was any THC in it really. I didn't take any for about 1 1/2 weeks and it just isn't all that strong.
So things I learned:
1) I need to do a double boiler next time. Maybe just a metal pan sitting ontop of the pot. The chef at the restaurant I work at does this when he needs a double boiler.
2) Use the rack in the middle of the oven. Not the one closest to the heating element.
3) Don't start this at 1am. You need to be awake and alert cause you can easily screw this up.
I have very good luck making my own capsules with coconut oil so I may just stick to that. I also want to try using veg glycerine. Seems like it would be a lot more user friendly than alcohol(and I don't really like alcohol anyways). I'm sure I'll give this another shot eventually, but I may try the 2 month sit and shake method. I have heard you can speed up the process of the shake method by baking the herb before doing this. Has anyone tried it like that? Either with or without baking it before starting the long extraction process.