X-Authentication-Warning: delorie.com: mail set sender to geda-user-bounces using -f
X-Recipient: geda-user AT delorie DOT com
X-Original-DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=sendgrid.net; 
	h=to:from:subject:mime-version:content-type:content-transfer-encoding; 
	s=smtpapi; bh=G9qQ3EVR76a8bnxqMYD//THhiXI=; b=pIufHR3S6DyeDUj991
	ZyKXj4Oun1bxLIjmicxsRcc2w7UMt0HzAG3ahNYI1r6ju7WxktAX5ry7wJuSVy+U
	r47TWLAyv8kRuLiqRHCFHnazEmLTbMDfjiIkrc+3E6eTdO9y9fJ8dHQqYutIJQi7
	Tqhty/gflshQdYLQSoAFn8gWs=
To: geda-user AT delorie DOT com
From: "John Griessen (john AT ecosensory DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Subject: [geda-user] thru hole slots in PCB
Message-ID: <411d8c80-deab-4bc4-2a97-9bb6829a7b7f@ecosensory.com>
Date: Thu, 12 Jan 2017 23:07:18 -0600
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101
 Icedove/45.4.0
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 7bit
X-SG-EID: V53lTA/kUP1+IqXnzXuv0M/cu/N8aMtf7nxyAyKnAkv6ETr3CI5eVZBcT5ZJSGQyS2Y2qXOuCraEfH
 AEh48sLVLjj1XmKuAQdrssqH+mbA5NVXLDenNRaHtKRedx/pG0Fs0cYbZaXgoiBEOGi5Gj6fWZz4PW
 SMmzHRrFmo+vPkpyTwibP4aQ19Ogr5wxUI8+U/zIM4EsAtm4ZQDkeC7q8ATsM4coZzMp1sjt1MHg7Z
 8=
Reply-To: geda-user AT delorie DOT com

Is there a way to get a smooth slot with PCB? (A non-circular plated through hole -- a round ended slot).

Is there a quick approximation to do with overlapping vias?

What I can find on websites says no, just use a bigger holed via for a metal tab solder hole.