An electrophotographic printing or copying machine includes a functional module which can be readily removed and replaced by service personnel. The handle comprises an assist handle, a handle mount that is adapted to be supported by the bed for supporting the assist handle for movement relative to the bed, and one or more latch configurations for latching the assist handle in one or more fixed positions relative to the bed. The guide wheel is equipped with a plurality of radial arms between which a space is provided for the elongated products resting on said supports. Preferably an extract from garcinia fruit ring is used as a starting material. Targeting is performed using any form of image-guidance, including real-time MRI, CT, or frameless surgical navigation systems. According to the invention, a calibrated orifice and a nonreturn valve which are connected in parallel are mounted in these pipes.