Fishing from rocks and over rough ground is logically where some of the best fis
Fishing from rocks and over rough ground is logically where some of the best fish are to be found, problem is, that by casting a baited trace into such ground you are taking the risk that you will never see that trace again. If the cast is no more than a gentle lob then you can rig with what has become known as a rotten bottom. That is a short length of light breaking strain line fastening your sinker to the end of the leader. Then if the sinker becomes hitched in the bottom, a firm pull and you will part the light line so retaining your leader, hooks etc. Problem with this method is that you cannot cast very far with it, because under a power cast the light line could easily part and fire the sinker in any direction with a considerable velocity, putting others and maybe even yourself at risk from a fast moving lump of lead. Alternatively you can use disposable sinkers such as pebbles or wet sand tied inside lengths of bicycle inner tube or scrap pieces of metal such as old nuts and bolts if you can lay your hands on such things.
Easily obtainable items such as old spark plugs which you can get from your local garage, often for free, make very usable sinkers which if you lose them in rough ground will rust and bio-degrade under the action of salt water given time. So if long distance casting is not necessary look to alternatives which will enable baits to be fished into rock and scrub ground to find the wily old fish that live there.