Be careful that the drivetrain lines up straigth to avoid vibrations.
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\nInstallation tips for hardy disc:
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\n - 12:9 bolts are recommended.
\n - Torque the bolts according to recommendations http://www.millway.se/atdragningsmoment/
\n - Make sure the propshaft aligns with the engine.
\n - Use rigid / hard engine and gearbox mounts
\n - Use washers on both sides of the hardy disc so that the bushings inside it won't slide off.
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\nIgnoring these tips increases the risk for imbalances and excessive wear.