This sweeper weight can be conveniently loaded with coins. Its centre of gravity is located right over the sweeper to allow maximum stability when the Vat moves. Below the link explaining why this accessory can be useful in prolonging the life of the coating. : http://b9creator.com/support/?mingleforumaction=viewtopic&t=485 The advised weight is about 20 to 30 grams for each of the two sides: that is about half of the maximum number of coins. Use the same weight for both sides. If you prefer not to use the springs, you can, but fill the container with coins. Fitting coins include: The cap locks with a little snap. To limit resin consumption, the item is a bit fragile: I haven't had breakage issues (I use a very strong resin) but take care or ask me to thicken some features. Let me know if you have suggestions, or you need the shape modified to fit coins from other countries or you need to hold more weight. You can slice at 50xy, as the design fits the smallest envelope.