I can't see the videos, but

Name even one part aside from maybe the batteries.

The motors? The camera? The antennae/rf circuitry? The frame could be out of so many different materials. Also, I think it's fair to call drone parts "common"

I can only go on what is reported. I also don't think it's something so guerrilla as winding motors, but a mixture of smuggling and repurposing. To your point there are several^[https://www.lbcgroup.tv/news/news-bulletin-reports/784852/hezbollahs-drone-supply-key-components-sourced-from-europe/en] reports^[https://www.newsrael.com/posts/ag6hnmf48gf] of busting European drone smuggling networks destined for Lebanon.

At the same time Hezbollah makes their own claims such as this propaganda video they released of their drone manufacturing facilities, and an article with some more context.

The release appears intended to emphasize Hezbollah’s claim of maintaining localized production and logistical independence despite regional conflict and repeated Israeli assertions that the group’s military capabilities have been significantly degraded.

Hezbollah has long stated that it developed an internal weapons production network focused on drones, rockets, and precision-guided systems. In previous speeches, the late Hezbollah leader Hassan Nasrallah described the movement as possessing domestically rooted infrastructure capable of sustaining operations under blockade or wartime conditions.