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Quoted from here
http://xuanfa.net/articles/true-stories-about-the-making-of-daba-buqiong-and-kazhuo-ande-pills-and-about-the-iron-clad-determination-of-a-great-yogi/
"Mozhi Rinpoche had a contest of realization power in tummo concentration with all my fellow brothers who practice tummo concentration. With the exceptions of Kaichu Rinpoche and a rinpoche from the Office of H. H. Dorje Chang Buddha III who has the realization of vajra power at the level of causing great movement of a vajra pill in public, the rest of us, including dharna kings and venerable ones, were no match for him. So, in the end, it was decided to let him be the chief master to produce the heat of tummo. Other rinpoches would be his dharma-protecting assistants. He stated that the purpose of his coming here was not to compare his realization power with others and was not for making Kazhuo Ande pills. It was a coincidence that he met this cause. He regards it as his duty to do something for living beings. His wish was to use the rare merit from this practice to persuade H. H. Dorje Chang Buddha III to conduct an initiation on him for the dharma of Vajra Body Substitution Meditation.
However, H. H. Dorje Chang Buddha III told him, “I am not able to conduct initiation of state practice. I have illnesses all over my body. I don’t have good health. I would like to ask you to give me a treatment with the heat of tummo. I recommend you learn from the master of Kaichu Rinpoche, who is named King Rinpoche. Without using his belly, his fourth-step tummo power can use just one finger to get you burnt and leave a scar on you.”
Thus, Mozhi Rinpoche respectively visited King Rinpoche and stated his request. Upon listening to what he said, King Rinpoche immediately prostrated toward the visage of H. H. Dorje Chang Buddha III and said, “Good heavens! My Buddha Master over-praised me. What kind of being am I? You, as a yogi, do not adhere to continuing your journey of searching for treasure in the vast ocean and now come to a lake to look for a pearl instead. Your boat is going the wrong way. Go quickly to beseech the Buddha! With the small ability you have, how can you contest with others? You should go quickly to repent yourself and beseech the dharma.”
Mozhi Rinpoche said, “Isn’t the Buddha Master ill?”
King Rinpoche laughed heartily and said, “The illness of Holy Venerable Vimalakirti was more serious! I will pray for your receiving the dharma of Vajra Body Substitution Meditation early.”
Mozhi Rinpoche regrettably mentioned that the Buddha Master did not teach him the dharma of Vajra Body Substitution Meditation and he did not know what to do. However, he said, “I have made my iron-clad determination, just like having swallowed a sliding weight of a steelyard. I will not leave until I learn the dharma Vajra Body Substitution Meditation. I will just stay here shamelessly until I learn the dharma. I came here to learn the dharma for the benefit of living beings.”
At the dharma assembly, Mozhi Rinpoche lay on the dharma board and had his head covered up so people would not know who was practicing tummo concentration. This great holy virtuous one with true realization of power and abilities never wanted to boast or praise himself. Everyone attending the dharma assembly was greatly moved and felt ashamed by such holy and pure style of humble self-cultivation.
When the great holy virtuous one was conducting the dharma, a porcelain pot for frying the medicine was laid on his belly. The high-temperature heat of tummo was strong and vicious and directly penetrated the thick porcelain pot. Rinpoches who used a finger to test the temperature were all scalded badly. They had to throw the medicine powder into the pot and get away quickly to protect their fingers from getting injured."
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