need help to repair Bissell carpet cleaner

Please someone tell me how to repair Bissell carpet cleaner.
I have a Bissell  carpet cleaner model 1698 Turbo Brush Power Steamer
Pro Series 1697 / 1698 purchased in 2005, used by my wife 2 times.
Now she says it does not work anymore, bought for $200, used once in
2006, once in 2007.  problem is that no water spraying out, brush does
not turn.  I got a repair manual from Sears and Bissell.  So  I took
charge and attempt to take it apart.  The hub housing is awful hard to
remove. I used philip screw driver removed 4  screws on hub cover,
turn it over, used 2 flat screwdrivers to ply open the front under lip
to remove the hub cover. Found brush not moving. Belt slipping due to
pump shaft frozen. managed to used plier to turn shaft, then brush
starts to turn. Cleaned out all debris. Found water not pumping
through. Traced line to heater on top handle. Opened middle handle by
removing screws, found heater, opened heater, found all corroded
inside. Use drill bit 3/16 drill out plugged holes, brushed cleaned
channels,  simulated flow, it works to that point. When I reassembled
hub cover back, found hub cover cannot close or go back exactly flush
tight. Thus  water tank outlet does not meet pump line intake.  So I
attempt to make it flush, many trials, removed  any possible
interference, including detergent selection knob and handle, red turn
wheel indicator, many  tubings, and simply short out flow circuit as
much as possible.  I got the machine to work 50% of the time only.
Sometimes the tank will meet the intake and work. Sometimes it will
not meet and not work.  It seems like the hub cover was designed for
tight fit with many fringes for interference.  Any suggestion to make
a tight fit?
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