Single-use character combinations are a secure mechanism for user authentication. According to the present invention, enzymatic conversion of sucrose and crystallization of isomaltulose are carried out simultaneously in a same reaction vessel. The release mechanism may be at least partially received by the first part, and may be configured to release the second part from the first position to the second position. A method of making a coupler assembly comprises the steps of providing a grid assembly having a channel, galvanizing the channel, and covering the channel. A remotely operated gate controls the flow from the melting pot to a mold.