Flat head screw is news to me. We bought 3 of the lenses, on in the 30k serial numbers, one in the 50k and one in the 70k and all where phillips. I do have same pitch but longer and with a hair larger diameter prototype screws that we are considering going with in the future that I could send you with maybe a slightly better chance for bite. Looks like someone had taken your lens apart in the past perhaps. email me at [email protected] to remind me of your address and I will send the screws (by some other way than bloody Canada Post Small Packet Air Mail).
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