The compressor clutch is typically a combination of three parts; the hub, pulley, and coil. The hub (sometime referred to as the clutch) is the very front part, a round metal piece. Next is the pulley, which is where the belt rides. Finally, under the pulley is the coil, also called a field coil. The coil contains a tighly wound copper wire, and is essentially an electromagnet.
Lantus is a long-acting insulin that is designed to be taken just once a day. (Click Lantus Uses for more information, including possible off-label uses.). It is manufactured by sanofi-aventis.
So the manufacturer of Lantus recommends it should not be mixed with any other type of insulin in the same syringe. One easy way of making sure you don't mix Lantus with any other insulin is to take the Lantus with a vial and syringe (no Lantus pen cartridge is yet available), and take the other insulin with a pen.