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I went through exactly this and ended up with the Optec 3" nearer the cam. Its suited the adaptors I had, but also I noticed the slightest movement in the Optec bearings, so I figured nearer the cam was best as it puts less stress on the Optec. The spacers on the OTA are rock solid and easily take the stress where as the the Optec near the OTA and then spacers with the cam on the end would seem to me to be a huge side load stress on the Optec bearings.
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