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Silver Helios 44-2 completely stuck helicoid
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PostPosted: Sat Oct 28, 2023 7:30 pm    Post subject: Silver Helios 44-2 completely stuck helicoid Reply with quote



I've separated the helicoid block. Some say to let it soak in white spirits (mineral spirits). Is this correct?


PostPosted: Sat Oct 28, 2023 7:55 pm    Post subject: Reply with quote
That could work, a second method for an all metal lens is low heat, 70 to 80 degrees C. After separating the halves you can clean with white spirits anyway, so either should work well.


PostPosted: Sat Oct 28, 2023 8:00 pm    Post subject: Reply with quote
Alun Thomas wrote:
That could work, a second method for an all metal lens is low heat, 70 to 80 degrees C. After separating the halves you can clean with white spirits anyway, so either should work well.


I have tried it in the oven at 100°C for 15 minutes and after applying Isopropyl alcohol and that didn't help interestingly.


PostPosted: Sat Oct 28, 2023 8:35 pm    Post subject: Reply with quote
WM1 wrote:

I have tried it in the oven at 100°C for 15 minutes and after applying Isopropyl alcohol and that didn't help interestingly.


Some oxidation of the metal surfaces?

S


PostPosted: Sat Oct 28, 2023 9:04 pm    Post subject: Reply with quote
Neat wintergreen oil penetrates best...
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