I used WD40 in case some water had got into the contacts I've been using it for yrs on electrical contacts and have had no problems it's a water dispersant and does have some cleaning properties but is not a dedicated cleaner...the gearbox locks when it's in P its the reverse gear position that's puzzling me as instead of going into the gate to select reverse you have to go half inch past before it will select the gear...there's a cable that goes from the gearbox to the gear lever could this be stretched or can it be adjusted to take up any slack if there is any ?