[TheForge] autodarkening SHIELD! really

[Peter Fels & Phoebe Palmer]

2 Questions please;

1. I've an older ( 2nd replacement) Selstrom Phantom Lite autodarkening 
cartridge ( with adjustable shade and sensitivity) installed in a beat 
up , even older 4" x 5" (?) large window shield. I think the suspension 
is the third replacement. With some aluminum foil duct tape i can paste 
it back together again. I tend to bounce them across the shop floor 
every now and then.
So i've been thinking that the newer one's must be a lot better by now. 
I've noticed that the large window style that i prefer isn't common. And 
i've read complaints about the durability of some models. Also seen 
advertised claims that the design minimized fume intake and weight and 
maximized comfort. Rather skip the logos and decals.
What i have works passably. Is it worth replacing?

2. Now that i have more welding amps available, the unfamiliar territory 
of water cooled torches looms in the future.
The prices for off the shelf, purpose made, cooling units seems larger 
than it should be to my uneducated eye.
All that seems to be required is a motor, pump, tank, radiator and 
pressure relief valve..and maybe a filter.
Is there a reason i can't fake one up?
Thanks for letting me exploit your considerable cumulative experience!..pf