Surely having Chinese replacement lenses in there would devalue it more? Presumably its for a ww2 sniper, if its going into a collection and not onto the range you might as well polish it off as the figure is not going to be that critical. The scopes from that era were pretty low power from memory, so you're unlikely to do too much damage to the figure anyway.
The atm volumes describe many ways of converting drill presses into polishing machines for small lenses as well.
HF will also dissolve the lens as it reacts nicely with SiO4, and is not something you should be able to buy, let alone play with it at home.
Cheers,
Andrew.
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