Originally Posted by frugalfabrics
Billy - you said 66-18...where is that listed? I always wondered where the dash and 2nd set of numbers came from?
The second set of numbers indicate the sub model of the machine. Every time the engineers made changes to the machine they added a number to the sub model to indicate the change. Some are very noticeable (like yours being a back tack machine) and some were very subtle and only the engineers knew what it was. Like a oiling hole was enlarged or the type of screw was changed things like that.
Billy