The sheriff may relieve any party from the consequences of any failure to comply with the provisions of these Rules which is shown to be due to mistake, oversight or other excusable cause, on such conditions as he thinks fit.

Where the sheriff relieves a party from the consequences of the failure to comply with a provision in these Rules under paragraph (1), he may make such order as he thinks fit to enable the claim to proceed as if the failure to comply with the provision had not occurred.