Load capacity is sufficient. However, hole punching is very severe. It is 57.3 mm <58.3 mm. Leave it at 57 mm and sharpen little by little with a spindle sander ... Unless you match it depending on the type of wood you can break it. Because it is a dimension that does not have a Fosunabit and a hole saw, I used a power bit of Kanazawa to make a hole. I am durable and want to use it again.
It fits within the 30 mm high and finished to a height that is no problem for sitting on the massage chair. Using six, you can move very smoothly. The hole of 57.3 Φ used Kanazawa's free awl W 10252627 K-107.