Thanks i still intend to get the spacing corrected. Orion produce a set of spacers specifically or this purpose a set contain 5, 10, & 20 mm spacers. At $29 it's ok value I think.
The adjustments made today may not have corrected the whole problem but its easy to check, even without the spacer the coma should be even. Well at least not obviously lop sided.
Ta.
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