Similar problem here. Ten year old clippers, almost identical internals as this video (different brand). In my case the clippers started making a loud noise and would not cut. That's when I discovered (for the time) that the head comes apart. That tiny black part fell out; it had broken off. Ten years service is very good for low cost clippers, but with battery, charger and motor working well, seemed a waste to bin the lot for the sake of a tiny bit of plastic. I could not work out the function of the small plastic part, I suspected that it was only to limit the sideways motion of the moving blade. It did not look strong enough to anchor a spring. I superglued it back in, with the intention to strengthen the joint with epoxy resin. Then found this video to find that the clip is indeed to anchor the spring! The spring in my clippers is far too strong to be anchored by that weak clip; very surprised it lasted so long. Doubt that repairs will be adequate, so will need to buy new clippers.

@@SaxJockey I think you're spot on, maybe there's a way to do some "plastic soldering" to get some metal in there, but that was above my level of patience. I agree it's a surprising weak point

@@Var_ Funny you say that, I have just located (dug out from the garage) some aluminium tape. Will try to create a hybrid tape/epoxy brace above the clip. There is practically no space for any reinforcement, so it will be my vey last try before it gets binned 🤭. Not complaining of it's useful life, it far exceeded the guarantee period; but always a pity to throw items for the most trivial (yet pivotal) faults.