<HTML> In a message dated 10/20/03 9:40:39 PM, Erwinspiano@aol.com writes: <BLOCKQUOTE CITE STYLE="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; = MARGIN-RIGHT: 0px; PADDING-LEFT: 5px" TYPE="CITE">I use a cheap & s= imple plastic caliper with a round wire coming out of one end. Only a smal= l hole is required to put it thru. Of course a finger or some other object m= ust be applied flush to the other side so the wire stops and a good reading = is taken. </BLOCKQUOTE> Years previous tool scrounging once netted me a depth mike with a spindle th= inned to .035 for some special application, and that's what got me thinking = about the current project: I hope to get my "sacrificial" mike down to .020 = since I only need a half inch or so, the drive being for a hole that will al= most disappear, mabye if the RH goes up a bit. I am aware this seems overkil= l, but i'm committed to trying it anyway. Will post results. Glenn C.</HTML>