Flagellation

When a sin persists despite your efforts to overcome it, is self-flagellation or punishing oneself for the sin permissible as a last resort, such as touching fire as a reminder of hellfire? Sayyed Mohammad Al-Musawi	Why do some Shia engage in Zanjeer Zani? Is it considered a part of Shi'ism? Sayyed Muhammad Husaini Ragheb
Could you provide me with proper references regarding permissibility of Matam? Additionally, which form of Matam is considered correct, simple Matam with hands or drawing blood through Zanjeerzani? Sayyed Mohammad Al-Musawi	Why is Zanjeer considered forbidden but regular Matam is allowed when slapping yourself hard on your chest can also cause hurt? At what point or in what shape, if any, could Matam by hand be considered disallowed? Sayyed Mohammad Al-Musawi