At rear battery's complicated. Original screw length is 40mmm and thus too long for rear batteries. The can no longer push. The next smallest DIN size is 30mm and would be too short. So hacksaw sawed off about 5 mm in the hand and of the original screw. If the manufacturer packs four 35mm bolts and then to raise the total price by 1 euro, there are 5 full crystal star.