Look at screwfix/toolstation for the thing to pull the cable through and the cable lubricant.
The stud finder should give a stronger signal from something thats surface mounted than set deep and also should give you an idea of width of what you are sensing.
Look at screwfix/toolstation for the thing to pull the cable through and the cable lubricant.
The stud finder should give a stronger signal from something thats surface mounted than set deep and also should give you an idea of width of what you are sensing.