Swords Hire on Main St Swords do them - got mine done z couple of weeks back - purring like new now (if only they could have automated it to cut grass itself!)
Another suggestion is Paul Burrell in Mornington, Co Meath - he did a great job on an old petrol mower which hadn't been serviced in 10 years.....running like a dream now! Sadly, like Nai's, it doesn't work on its own!!