Back in the day,I had a 1978 White Road Commander Cab Over Semi Tractor,its heater,fresh air vents were all cable operated.They had knobs attached with little clips dohickeys.Worthless! Little 4 in.vise grip,problem solved and what a little lube would be good too,but hard to get behind the dash and all the **** to get to.If you needed the vise grip for something else,no need to dig thru stuff.