The thing is that your scope is focussed on a flat screen, the cross hairs won't shift but the image your looking at does if the thermal is misaligned. I trialled a thermal clip on from 55six and found it wouldn't realign to within 1.5 mil with repeated attachments. I was taking the whole unit adaptor and all off mind you. Maybe if I'd left the adapter on and unscrewed the unit it might have been better.
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