Glass Block Repair - Installing A Replacement

Never done this before. Seems to have worked as months (now years) later it's still there and does not leak. I have a video from when I removed the original cracked glass block (glass brick).

Some Tips:
- Wear proper eye and hand protection in case the glass chips.
- Rubber gloves allow direct handling of the wet cement without damaging skin.
- Don't force metal tools into the space between blocks, the blocks chip rather easily.
- Old drill bits can be used to space the block (just be careful not to pinch the bits in the spaces as the blocks chip easily)

(Re-edit for Annotations)
WARNING: Always use proper safety protection and proceedures. If you don't know get help or training or don't to it.