Is Your Colon Your Master?" by M. B. Sackheim, Kolon Motor ad, Sunday School Times Dec 8, 1917 (leaf 16)
The pattern
This still is filed under If-then promise.
Define
A conditional contract: if you do this, you get that. The sentence can be tested against the reader's own case.
Mechanism
Specificity does the persuading. The if names the action. The then names the outcome. Hedging kills it.
Verdict
We can name both the action and the result without adjectives
Why it works
The whole construction is camouflage. Set in the same face and measure as the Sunday School lesson beside it, with a byline and subheads instead of a border and a logo, the piece is read as editorial before the reader realises it is selling a device - and a religious weekly is precisely where an ad's guard-lowering matters most. The headline works by converting a physical complaint into a question about who is in charge of you, which is a status and autonomy frame rather than a medical one, and the opening paragraph then earns the metaphor honestly by conceding that some slaveries are pleasant before turning on the unpleasant kind. Attribution moves through a chain - physicians say it, sanitoriums use it, massage explains it - so no single claim carries the weight. The close is a free booklet rather than a sale, which converts curiosity into a name and address and defers the real selling to the mail.
Steal this when
You are selling something slightly embarrassing or hard to explain to an audience that does not yet believe it has the problem. Run it as a bylined article in the host publication's own typography, diagnose the symptom as a loss of control rather than a disease, and ask only for a free booklet on the first step.