I think the problem is that Weaver has changed ownership a couple of times in the past 10 years. I had two of these an recently switched over to a Leupold 45x Competition. My experience was great with the Weavers. Do you have your warranty card with the original proof of purchase? I would also post this question on Benchrest Central. Lot of guys there with significant experience using the T36. If fact I seem to remember this exact question being discussion in the past year or so. Do a search with the search engine on BRC and I bet you find your answer.
Luck, Tim
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