Triflow is the way to go with the modern plastic machines. Access to the rear requires taking off the hand wheel. Very gently wiggle about 1/8 or less while pulling outwards. VERY GENTLE... The screw that locks the hand wheel protrudes into the plastic of the hand wheel, so too much of a twist will crack the handwheel or deform it. It is a nightmare. Once the handwheel is off, simply remove the screws. Some are under the machine, others are on the rear plastic. DO NOT for force anything. Then carefully remove the rear...it interlocks with the rear panel but will almost fall off once the screw behind the handwheel is removed. PM me if you need more help.