The island in the 310GK has drawers on the right side then the sink and on the left an open cabinet where a dishwasher can be installed. Unlike a kitchen cabinet where the cabinet frame sits in the floor the island cabinet rests on a rectangular frame attached to the floor. It is supported by 2 screws at each end and the 1/4 inch plywood sides of the sink cabinet. The plywood is attached to the cabinet frame with 5/8 inch 16 gauge staples. If the screws on the left side are not installed properly or give way the staples in the plywood can fail to hold. There is more support at the right end and it is a shorter distance from the support. The easiest solution in my view is to remove the door at the left side (4 screws), then remove the floor of the cabinet (4 screws) and install a 1x3 to the end of island on the inside that rests on the frame. Use 1 !/4 inch screws or staples. DO NOT HAMMER.
View attachment 35796
I hope the photo inserted.
I'll do another post titled kitchen island construction with more details later today