Hi i have started to get a squealing sound coming from what i think is the front driver wheel when going round small roundabouts and tight corners, i am not going fast round corners ever at 20mph round a roundabout it does it. Any ideas? Im guessing it maybe needs oil in the swival hub but seen that you can drain out the oil and replase it with one shot swival grease, how easy is this to do and has anyone done it? All and any help much appreciated thanks.