It is time to restring the old openback Kingston 5 string. I know this because my fourth string has joined the dearly departed...The instrument is strung with nylon strings for a more mellow sound in "old time" and minstrel type songs. I frail upon it but every once in a great while do try some three finger on it. I want to retain the sound to an extent but am not against 'experimenting' with other string configurations. My first, second, and fifth string all measure .030" The third string measures .038" and the bronze wound fourth measures .042". The question is this: Has anyone had any experience in different size (diameter) string combinations. Thanks