If you are going to try tutning it I would suggest loosening the gland nut about half turn. It might leak a little but that could also act as a lubricant.
Nooooooo!!!!! WD40 will rot the rubber seals. I'd go for the simple option of turning off in the road and replacing the stopcock, it's much less hassle.
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local