• They stick on using surface tension from a drop of water - IKYN.

    See this thread on Yacf for all the info:
    https://yacf.co.uk/forum/index.php?topic=83623.0

    Mine worked OK on the IPWR. The one on the right lens dropped out after a few days but it wasn't strong enough anyway. Right lens is very curved so wasn't surprised it happened. The left one, which I mainly relied on, stayed in all the way.

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