Camshaft Thrust Plate MEMF127Camshaft Thrust PlateSuit GM LS Series 1999 15 MEMF127 MF127 Worn thrust buttons and thrust plates allow for cam walk and component misalignment. Melling camshaft thrust button plate applications protect your engine investment by returning your timing back to the desired specifications. Always replace with new Melling buttons and plates whenever a camshaft application calls for a thrust button plate component.