Procedure for fitting the tank:
Fit the two ears inside the front of the tank's tunnel onto the rubber pucks mounted on the frame near the headstock,
Spit on the fingers of your right hand while holding up the rear of the tank with your left,
Smear the saliva on the rubber donut under the rear of the tank,
Line up said donut with the mushroom headed post pictured above,
Push down on the rear of the tank until it pops into place.
The front of the seat helps hold the tank in place.
;-T