The gap is no mystery or no design its simply this ...
The cub (or jag ) is no overall design as such ... its three simple molds , the cub had two rectangular containers on top
bit like this
http://www.tanks-direct.co.uk/10-50_litre_water_tanks/32_ltr_water_tankTo mount the waste gate u first have to put a tank connector in place to hold the wastgate .. a bit like this
http://cdn2.bigcommerce.com/server2100/a951f/products/485/images/1012/Hansen_Outlet02__59607.1346754102.1280.1280.png?c=2as u can see u cant mount this right down the bottom of the tank as u need to leave a small space for the bits that tighten the holepipe of the connector in place .... then u connect the waste gate to that .
A modern machine is more of a design unit and has a molded tank bottom with a slope to flush the waste out and a lowered waste gate fitting to ensure all waste id removed .
The point i was making is why ...oh why would u go for these outdated flawed ' designs ' when there is better available to u
...in every way from , quality , power , heat , ergonomics , manoeuvrability .
And u guys using these single vacs as a ' main ' extractor ' ? u need to step your game up and improve your efficiency and make life easier for yourselves.
If the likes of ED.V or the Nick guy was getting back into carpet cleaning again do u think they would be using a cub ... hell no , there would be power and heat involved , they all had multi vac machines or Tms and lots of Heat !
those guys are laughing at you all