Rule 4 Repayment of fine

If, in any case, after a fine has been paid the person on whom it was imposed shows cause which satisfies [^f1 the judge] that if cause had been shown at an earlier date, he would not have imposed a fine or would have imposed a smaller fine, or would not have ordered payment or full payment to be enforced, [ the judge] may order the fine or any part thereof to be repaid.