Anyone have this PH4 rear aperture piece and lenses?

[Peter Laidler]

Rick asks (above) about tightening down a thread retainer onto the lens. We used to do it but only (?) when the lens was cushioned - as in the sprung spacer between the lenses and the retainer was brass. If not, then a 1mm thick neoprene O ring will do the trick and probably waterproof it too. Not a bad idea to waterproof the ocular lens of a No32 Mk1 type.