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I would like to point out that even welding the ED80 to the main tube will not rid one of flexure issues.
I know of some who have removed the focuser completely and mounted their guider on an independant plate in order to overcome flexure. Flexure is caused more by guider movement relative to imaging optics...regardless of just which is the weakest link. The two weakest links in the imaging chain are the focuser(s) and mirror flop (assuming no mirror lock), but even then....... Others have tried machining up elaborate snugg fitting clamshell type tube holders in an effort to get rid of flexure, only to sheepishly resort to addressing focuser and mirror cell issues.
Leon, if you only want to image through the ED80 with no guiding thru the 12", flexure is not going to be such an issue anyway; not with a Canon 5d on the ED80. The weight of the Canon on the stock focuser will be a flexure issue even after you Dynabolt the ED80 to the main tube.
luck either way,
Doug
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