Long shot, but might be worth trying
In the past, I have found the color of the sights (especially the front sight) can affect POI relative to POA, and the cheapest way to test the 'theory' is to paint them.
I recently had trouble finding it, but Testor's-brand scale-model paint is still available, and it's a very fine enamel that comes in small bottles priced inexpensively.
On a 'white' gun like your 642-2, I would probably try a dark color first, possibly flat black, for better 'contrast'.
HTH 
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Complete thread:
- Pocket Expansion -
Scott Ambler,
2013-07-10, 17:54
![[*]](themes/default/images/complete_thread.png "Open whole thread")
- Pocket Expansion -
Slow Hand,
2013-07-10, 18:12
- Slow bullets; go with LHPs - Rob Leahy, 2013-07-11, 10:42
- I imagine a lot of bullets would fail the 'Sand Test' -
FOG,
2013-07-10, 19:14
- I imagine a lot of bullets would fail the 'Sand Test' -
Scott Ambler,
2013-07-10, 19:35
- I imagine a lot of bullets would fail the 'Sand Test' - lee jurras, 2013-07-10, 21:41
- Long shot, but might be worth trying -
FOG,
2013-07-10, 21:48
- Long shot, but might be worth trying -
lee jurras,
2013-07-10, 22:04
- You probably have a 'point' there (LOL) - FOG, 2013-07-10, 22:28
- Long shot, but might be worth trying -
lee jurras,
2013-07-10, 22:04
- 'Sublime' J-frame Front Sight Picture - FOG, 2013-07-10, 22:36
- I imagine a lot of bullets would fail the 'Sand Test' -
Scott Ambler,
2013-07-10, 19:35
- Pocket Expansion - Jared, 2013-07-10, 23:47
- Pocket Expansion -
Slow Hand,
2013-07-10, 18:12