CONTRACTOR WAS ON SITE TO DISMANTLE TWO KOMATSU DOZERS THEY HAD PURCHASED FOR RE-SALE. THE INJURED WORKER WAS DRIVING A PIN FROM THE EQUALIZER BAR WITH A 20# SLEDGE HAMMER. HE STRUCK HIS FINGE R BETWEEN THE HAMMER HANDLE AND THE FROM IDLER OF THE DOZER. HER RETURNED TO WORK WITH LIGHT DUTY RESTRICTION. NO DAYS WERE LOST.