My suggestion is ditch the binder clips. I used them for a while but unless your build platform is 100% not warped, they will warp the glass to whatever shape your bed is. Instead spray some hairspray on both sides of the glass and cycle the heat bed once or twice. The glass should be stuck like glue. All you'll have to do in the future is re-apply hairspray and put the glass down.

How do you get a piece of glass for the platform, do you order from a place that custom cuts a piece to a certain size and thickness?

As far as the glass you have a couple options.  I am using regular 1/8 window glass from the local hardware store held with three binder clips, IIRC about $3 for the glass and a couple bucks for a dozen clips you may want o pick up a can of Auanet hair spray if you use PLA.
Mcmaster carr sells borosilicate glass 1/4 in thick for about $26.
Borosilicte glass aka pyrex is what is used for glass ovenware and lab glass subjected to heat.

And I struggled with the knob hitting as well.

Tin

Tin

It's not good and could severely impact your output quality. I designed an alternative endstop for the SD4 that does not require you to use that gear. You can just insert a screw instead. Search Thingiverse.

One option is to add glass to the bed. This will improve adhesion and also allow you to run the z screw lower. You can also adjust the height of the bed using the 3 screws. I recommend squishing those springs down as much as you can while keeping the platform level so the bed doesn't have as much play.

Yeah I figured it wasn't good, the 3 screws on the bottom are about as pushed in as they can be, I'm not sure why it's still riding that high.

How do you get a piece of glass for the platform, do you order from a place that custom cuts a piece to a certain size and thickness?

Thanks for the help!

    ~ Jody

One option is to add glass to the bed. This will improve adhesion and also allow you to run the z screw lower. You can also adjust the height of the bed using the 3 screws. I recommend squishing those springs down as much as you can while keeping the platform level so the bed doesn't have as much play.

When the y-axis moves it rubs on the screw and i'm sure that can't be good for it. Is there another way to raise the bed's end-stop so that it's closer to the extrudor without having to raise the hand-knob thing so high up?

Thanks.
    ~ Jody