Alberti Cipher Message

In a world where mono-alphabetic ciphers were losing their secrecy, the quest to give the cryptologists the upper hand against their cryptanalysist rivals had begun. One of the first attempts at enhancing the secrecy was to use poly-alphabetic ciphers, but how? Leon Battista Alberti in his treatise De Cifris was one of the first to attempt this daring task. He invented a simple but very effective tool. This device would later be known as the Alberti Cipher Disk. It consisted of two disks connected by a pin in the center of both. The outer disk consists of capital letters and the inner disk is made up of lower case letters. To begin a cipher or to crack it, the Index letter has to be known. The index letter is chosen from the capital letters and once agreed upon, the first lowercase letter is to be lined up underneath the capital index letter. So if the index letter was D and the first lowercase letter was an "n", the lowercase n would be placed underneath the capital D on the cipher disks. If a lowercase letter was coded for a number between 1-4, that lowercase letter would now be placed underneath the index letter. Also, some letters can code for the deletion of the previous letter uncoded or they could code for nothing at all. All of this is decided beforehand between the sender and the receiver. Here is my humble attempt at this complex cipher:

Index:R

nrbbpxnyrbetgyhdbyydkflleykny.