Question for cuckoo clock experts. Please help.

I have a really old cuckoo clock & I am missing one of the pine-cone weights. I was told to buy another weight that was the same weight as the one I have. The thing is, the weight I have, appears to be nowhere to be found, online or in antique stores. The weight of the cone I have is 266.8 grams. Does anyone know which weight I should buy that will be compatible to this one? The cuckoo clock is a one day (24 hours) model. Any help is very much appreciated. Thank you.