I'm probably forgetting something but have we discussed this extension previously or is that something you added for the powerfeed? If it is, how does it keep from unscrewing? I can't quite make out what the end opposite of the threads looks like from these pics or how it would engage. Maybe it's just for support and for extending a location to screw to and hold the assembly in place?
Also, I assume since there's no extended portion that the manual handle could ride on, you decided against having a 'manual' option or is that extension piece serving both purposes?
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