81.1. Replacement of advocate or notary: An advocate or notary in private practice may at any time replace, within the scope of the same mandate, another advocate or notary in the same practice to whom the mandate has been entrusted. Such replacement shall be effected by means of a notice signed by the recipient and transmitted by mail or by telecommunications to the director general who entrusted the mandate. The notice shall indicate the legal services for which the replacement is made and the period during which it applies. The director general is bound by such notice.