Spartan brand curved glass shower door installation info needed.

What do you need besides the rollers? They are still available thru Maax.

You need a specialist glass service for many reasons. These companies can assist you with all your glass needs such as glazing, emergency glass replacement, installation of emergency efficient glass, fitting framed or frameless shower enclosures and patio doors.

The wall was not perfectly plumb before the fixed glass was attached. The top needs to be shimmed out 3/16 and resealed against the wall. On the other hand 3/16 is not much of an error. Maybe no one else will notice it.

Assuming that your two heads are fed from the typical curved wall mounted shower pipe, what you need is a diverter valve. Removed both heads till it's down to just that curved pipe. Get a diverter valve from a plumbing supply store. Tell the sales folks that you want to install a diverter valve so that in one position, the hand held receives water and in the other, it cuts the hand held and puts it to the reg. shower head instead. They should give you a "T" sort of fitting. The female threads of this screws into that curved shower pipe. Then you will find two male thread ends. These connect to both your shower heads. Finally there will be a push/pull knob that is operated to control which head gets the water.
Nimsgame

Try looking at shower door suppliers, and glass companies that make shower doors.

Likely a blockage in the line. Corrosion or other damaged parts. Try cleaning the filter screen first. Check for normal water flow without the shower unit attached to the spout. If OK, then the unit is the issue.

Sterling has a video on their website that explained what I needed.