The Mainspring
| MPAA Rating: | NR |
| Country: | United States |
| Directed By: | Henry King |
| Written By: | Frances Guihan, Louis Joseph Vance |
| Cast: | Robert Ensminger, Ethel Pepperell, Arma Carlton, Cullen Landis, Charles Blaisdell, Henry King |
| In Theaters: | Aug 17, 1917 |
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