Nissan Sentra GA16DE, as is the case with many other Japanese engines, have recessed valve. As such, a common valve spring compressor design like the one below won't work.
One tool that can work (or rather be made to work) with recessed valves is Leslie 36200.
To install the valve keepers, use it without the black attachment. Just position it on top of the valve keepers and push down. It has a strong magnet at the end so as you push down the valve spring retainer, the magnet will capture the keepers.
A valve spring retainer and valve keepers.
But as it was, its diameter was too big for the valve cylinder. So it needed to be filed. I didn't have a grinder so it took me 3 hours while watching Pink Panther to file it down. Oh good times.
The yellow zip tie represented my target diameter. It was set to a slightly smaller diameter than the valve cylinder's.
I pushed the zip tie as far down as possible and marked places that were still thick.
1.5" was deep enough for GA16DE.
I don't have a picture of using it to remove the valve keepers, but here's one of me using the installation attachment. Just assemble the valve spring, retainer and keeper, and push down with the tool. Note that I was posing for the picture because I didn't take some while I was doing the actual installation. In a real installation picture, you should see an air compressor hose going into the cylinder or a string of nylon rope to float the valves up.
If you do not have enough power to push down the tool with your hand (awkward position, short stature, etc.), you can try pushing down the tool with your body weight as pictured above. Use a piece of wood to spread the pressure and push down. This works for the intake valves too which are positioned further inside the engine and may not allow you to push down effectively.
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