Abstract: A device for holding a rotary element stationary relative to a fixed body, the device comprising at least one element, adapted to engage with the rotary element to hold the device in a fixed position relative to the rotary element; and an engaging member, adapted to engage with the body to hold the device relative to the body.

Abstract: A device for holding a rotary element stationaly relative to another rotary element adjacent thereto, comprising a first holding member engageable with one of said rotary elements; a second holding member engageable with one of said rotaly elements; a third holding member engageable with one of said rotary elements; a fourth holding member engageable with one of said rotary elements; and structure connecting said holding members together and providing for adjustment of at least three of said holding members relatively to one another, and for fixing said holding members in set positions relative to one another.