Welcome Gentlemen Colleagues of the Noble Scientific Art of Doll Husbandry. I conducted a experiment similar to several that are aforementioned in this Discussion thread. I wish to extend thanks and credit to all that have contributed to what may be a repeat of materials and techniques. As they say, there's no need to reinvent the wheel, and if it works, use it. The following is an account of my particular process, theoretical conjecture, findings, and results.
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I made an insert cup for a silicone insert from a common straight cylindrical plastic water bottle by cutting the bottom end off with scissors. I then wrapped the majority of it in silver 3M duct tape, especial around overlapping the inside and outer lip of the cut edge of the bottle to prevent damage to the soft inserted device. The silicone device used was a Doc Johnson Sasha Grey UR3 Cream pie pocket p_55y, which I procured at a nearby local "Love Boutique"(actual name). The bottle/cup is short enough so that the insert sticks out of it a little. The cap end is on the back, making it like a bullet, facilitating safe insertion to the tight cloth lined invagination. I remove the cap from the bottle/cup when inserting the apparatus into it so that the air may escape out that end; voiding any resistance possible due to back pressure. Once that is in inserted to a sufficient depth, I screwed the cap back on. This created vacuum that may have assisted in the retention of the p-55y apparatus in the bottle/cup. I put those in the plush insert, then a thin plastic bag over that so it can slip into the dolls cavity easier. The insert fit very well in the doll, was snug, and didn't move, shift or rotate. The insert, protruded just slightly, but in so, seemed to enhance and maintain internal penile contact (who doesn't want that?
) while in missionary position. Also the bottle/cup seems to offer additional resistance to internal expansion during performance.
In other words, it made it a little tighter compared to using it for it's primary intended use; as a handheld masturbation apparatus, whereas additional gripping force from the hand would produce similar results. The UR3 texture is extremely lifelike, and the shape of the opening facilitates positive manageability in penetration. It warrants a water based lubricant for use; I used Astroglide liquid.(everyone seem to have a favorite) The unit was easy to remove, clean, dry and reinstall. There was very little external soil to clean afterwards as the plush insert seemed to have shielded the doll body from contact with liquids produced by the experiment. The Doc J. insert itself is a closed end unit, and was prone to creating vaginal flatulence.
This may seem humorous at first until you realize that it results in an additional vacuum force, which imho was responsible for the most powerful orgasms to date!
note-(I may have made contact with a deity, not sure though, I'll get back to you on that, further proof needed to confirm.) The active practical contact in this experiment was repeated 4 times to gather possible variations in results. Granted 4 'runs' may be weak in quantitative assessment, I'll have to admit it sure felt I really needed it. Additionally, the UR3 material is extremely supple and yields to opening very well for washing and drying, so that additional ecounters may commence with relative expedience. Total cost: 30 minutes labor, $25.00 in materials (sans doll)
This concludes the report of findings in my experiment today. Once again, thank you one and all for you contributions and I hope others may glean something of importance and relevance from the results of my variation.
Photographic images of the device can be provided by email if desired; please PM me.
Thank you, and goodnight.
Lemminkainen
2.5 months elapsed w/35-40 uses since beginning this product experiment.
Last week the silver 3M duct tape that was used to line the top of the cut end of the bottle started becoming soft, tacky, and lost adhesion from the bottle resulting in a sticky residue being applied to the silicone insert.
What caused the 3M tape to soft, tacky, and lose adhesion?
I disposed of the original bottle, replacing it with an identical model, cut the exact same way as described before. 
Instead of duct taping the bottle to protect the outside of the silicone vagina, I've slid it into a latex glove, then reinstalled it into the bottle the same way as described in the original procedure. Product use will resume with consistent frequency, and a reexamination of its status reported in 2.5 months, notwithstanding significant findings to report beforehand.
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