Knickelbein PleaWilliam Kmckelbem 28. Woodruff, today changed his plea frominnocent to guilty on eight countsjf burglary in connection with aseries of break ins at summer homes in the Woodruff-Minocqua area late in 1961,Judge George A. Richards ordered Knickelbein bound over for further proceedings and continued his bail at $5,000 Knickelbein earlier had denied the charges and a preliminary hearing had been set for Friday morning.Three other Wlt;xdruff area menalready are serving terms in Gteen Bay reformatory and Waupun state prison for their participation in the series of burglaries. They are Franklin J, Stevens. 24; his brother. Henry J , 18, and their cousin. Norman W Stevens, 22.