Always Measure Twice

I got the code to cut a circle pocket leaving a central cylinder working correctly.   But when I measured the interior of the PVC tube in which this part will go, I recorded it as 2.853".  I should have immediately remembered, "No it is about 2" ID."  I was cutting out of a 3" x 3" workpiece so I should have had plenty of room.  I have two more pieces of acetal which will be not pretty but you still make a serviceable part. One of these is a 3.2" x 3.2" x 1/2" piece that i abandoned when I realized that my outer cut would have to go through the vise jaws.  But I was trying to that with a 1/2" diameter end mill.  With a 3/16" end mill this will work.