Plastic parts are held by a holding device in a position for transfer to a receiver. Each part has a wall with a pierceable wall region that is accessible from one side, and the holding device is provided with a needle. With the part in the transfer position, the pierceable wall region is pressed against the needle, so that the needle penetrates the pierceable wall region and the wall is secured to the needle. The holding device may be a magazine type with multiple sockets for holding corresponding parts on needles.