I learned this from IBRed (Riley N from Modesto CA):
I was having a hard time during hive inspections, as I found it difficult to get bees to go down between bars as I tried to put bars back together.
I found that the bees tend to get squished between bars as you try to squeeze bars together, and on a hot day if can get difficult to be patient. I found this problem to make inspections longer than I wanted them to be, resulting in more stress on the bees (and me).
During my earlier thread on TBH Management, IBRed made a suggestion which I found so helpful that I wanted to pull it out and make a separate post of it.
He suggests having a tool which is simply a strip of wood, metal or some other material that is as long (or longer) than the top bars, and is about 1/16 of an inch (1.5-2mm) thick (height doesn't matter so much). A long thin strip - kind of like a ruler.
To use it, you just move your bars close together, until you're just down to the width of a bee - almost beginning to squish. Then you gently set your "bee-down strip" in that space, on top of the bees. The strip moves them down under the bar, as you've effectively divided that space to a point where it's too small for them - but you haven't injured them.
Then you squeeze your bars together against the bee-down strip, which keeps them from coming back up into the space. One you've got it pinched, you pull it up out and finish pressing the bars together. Presto.
I used a metal framing square and found it worked pretty well, but IBRed warns that anything thicker than 1/16 will allow a few bees to get their heads pinched. He crafted one by ripping a 1/16" strip of wood with a table saw. You could probably use a lot of things.
I have found this tool and method to greatly increase both the speed and pleasure of an inspection.
You may know this method, or have one which works as well for you, but I find it quite difficult as a beginner with top bar hives to get useful and timely information regarding management. Forums are great, but compared to the activity and information available to Lang users - its a tiny pool of information.
I hope this helps you, and I encourage you to share your own ideas - however small.
The little things can make a big difference.