Yes, I expected such and thanks for sharing the commentary you use. My comprehension is that of John Gill's, in that the passage refers to those who held not to faith but was only professing it, for holding to faith results in a good conscience.
Gill: "Which some having put away"; that is, a good conscience; and which does not suppose that they once had one, since that may be put away which was never had: the Jews, who blasphemed and contradicted, and never received the word of God, are said to put it from them,
Acts 13:46 where the same word is used as here; and signifies to refuse or reject anything with detestation and contempt: these men always had an abhorrence to a good conscience among men, and to a good life and conversation, the evidence of it; and at length threw off the mask, and dropped the faith they professed, as being contrary to their evil conscience: though admitting it does suppose they once had a good conscience, it must be understood not of a conscience cleansed by the blood of Christ, but of a good conscience in external show only, or in comparison of what they afterwards appeared to have: and, besides, some men, destitute of the grace of God, may have a good conscience in some sense, or with respect to some particular facts, or to their general conduct and behaviour among men, as the Apostle Paul had while unregenerate,
Acts 23:1and which being acted against, or lost, is no instance of falling from the true grace of God, which this passage is sometimes produced in proof of."
If you wish to view the rest of the passage by Gill:
https://www.ewordtoday.com/comments/1timothy/gill/1timothy1.htm