Abstract: A lift is disclosed which enables an invalid to move without the aid of another person, from a seated position to a standing, or new seated position. The unit supports the body such that minimal upper body strength is required, and body size is accommodated by simple adjustments of the lift arm length and height.

Abstract: A wall contacting device, such as a roller reamer used in earth boring, includes a block, e.g. supporting one end of a roller shaft, making an interference fit with a socket in the body of the device, there being tool passage means between the body and block; a disassembly tool is removably received in the passage and includes a pressure portion engaged with the block and a head portion to receive impact; and cooperating guide means on the body and tool includes coaxial cylindric surfaces on the body and tool for supporting the tool for rotation about a fixed axis, the pressure portion of the tool being a portion of an Archimedian spiral coaxial with the cylindric surfaces.