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@Oswald
Ok .. Force rear mech = 12g saving = £7/g roughly and I will agree some performance benefit by going short cage. To get that weight difference Sram use a magnesium alloy inner link and a carbon outer cage on the Force mech. Most of the gain is in the carbon outer cage. I haven't seen an Apex mech close too, but all the rest of the range you can simply change the cage assuming you have the replacement parts.