These are called ladder jacks. They are available at most hardware stores that sell ladders here. In my region you’re still allowed to use them if you set up guardrails or are tied off. I was working on my own house in this video so there are no governing safety regulations for working in your own home. They are definitely VERY handy for small jobs like this where setting up pump jacks aren’t really worth it and where you can’t access the location via a man lift. With anything, there are risks -

Homemade ladder jack, here's a closer look at the jack, it's built with scrap wood & can easily support 300 LBS. It makes working on a ladder much easier and works awesome as scaffolding in tight areas. Obviously this isn't OHSA approved, but its very practical and easy to build. #ladderjack #ladder #ladderwork #extensionladder #diyprojects #diytools #toolsofthetrade #toolmaker #toolrepair #scaffolding #scaffoldbuilder #scaffolder #masonryrepair #masonrywork #carpentrytools #carpentryskills #hom

Here's a closer look at the homemade ladderjack. It's easy to make but you can also buy one premade. As you can see it makes working on a ladder easier #ladder #laddersafety #ladderjacks #carpentrytip #carpentrywork #framerlife #framing #diyrenovations #toolstoday #toolsofmytrade #diytools #diytips #diytutorials #sidingtools #sidingcontractor #sidingwork #loghome #logcabins | Meyers.makes