更换马桶进水阀时无法接近背螺母，需确认水箱拆装路径

来源证据

用户在更换马桶进水阀时，不确定水箱内侧白色塑料件是否覆盖固定螺栓，并考虑抬起水箱以接近阀门背面的螺母。

Trying to replace the fill valve on my toilet, and I have already asked about it here in other words, want to check my approach first. Photos attached. Close coupled cistern, blue float fill valve, fed by a flexi hose not a hard pipe. On the shelf inside there are two round white plastic things, one with a slot in it, one that looks like a plain cap. I'm assuming those cover the bolts holding the cistern to the pan, and that undoing them lets me lift the cistern off to reach the backnut under

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