I can only repeat what others have said - it doesn't pay to skimp on something as safety critical as a boom arm, the consequences of it crashing down and injuring someone are far too serious to risk - and anyway, is it worth risking damaging an expensive flash head by using a cheap boom arm?
I've just looked at the Lencarta site, they used to have a heavy duty boom arm that was excellent, no longer there but they do have their standard boom arm, which I've used for years, complete with wheels, and it's excellent for the price
https://www.lencarta.com/all-products/light-stands-boom-arms/studio-boom-arm-with-casters
This, to me, is the minimum that I would consider.
They also have their wall mounted boom arm, much safer, much more stable and even cheaper, but with the big disadvantage that it needs to be bolted to the wall or ceiling, and not only does this make it a permanent fixture, it also restricts lighting arrangements
https://www.lencarta.com/all-produc...s/wall-mounted-telescopic-heavy-duty-boom-arm
The ones with a worm drive, for easy adjustment of the angle, are great in theory but the ones that I've seen are very badly designed from poor materials, and in my view are not fit for purpose.
And finally, there are the C stands, popular but again in my experience, a poor choice. Their footprint is far too small for rigidity and anway, who had the bright idea of making a stand with a chrome finish, that reflects unwanted light everywhere?