I am running my vls660 60watt. I have been given a price of $1500 for the attachment.First off will the older rotary attachments work with my newer machine are the plug ends the only difference ?Is there any place on the forum to put in looking for used laser rotary?Finnally I have A job for 150 wine glasses that the guy has the glass what should I try to get per glass.The job takes 2min. to run?If I knew what the going rate for glasses was it would help me figure how often I would have to engrave glass to pay it off.Thanks for any info Chris