Need to buy a magnet ring with a larger hole in the center, you can take a look at this one, OD size 29.5mm, hole 23.5mm, thickness 1mm, made of NdFeB material, belongs to the thin strong magnet ring, you can adjust the size, performance level, plating, etc., according to your application, you can contact us if you have any requirements.
29.5x23.5x1mm NdFeB Strong Magnetic Ring Sample Size Reference;
May be a better fit for your product;
Thin flat neodymium strong ring magnet dia 29mm x 18mm x 1mm
Ring magnet knowledge article;