If your turntable is sluggish or the bead breaker arm won’t hold its position, you likely have a hydraulic issue. The Monty 455 relies on a robust hydraulic unit, but seals fail.
If the jaws are slipping on the rim while rotating: hofmann monty 455 parts
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The Monty 455 features a vertical tower with a tool arm that swings into position. If your turntable is sluggish or the bead