Doug, for what it is worth I installed a ladder on my 1986 Montgomery 15 I am very happy with. I essentially did it entirely without help. A write up is: http://davidgrah.net/Ladder.pdf David GrahBishop California Message: 14 Date: Wed, 1 Aug 2018 17:03:48 -0700 From: doug <doug9326@gmail.com> To: For and about Montgomery Sailboats     <montgomery_boats@mailman.xmission.com> Subject: M_Boats: boarding ladder Message-ID: <F11D3E32-D386-47FC-89D2-05C608E9FF8B@gmail.com> Content-Type: text/plain;    charset=us-ascii What is the best boarding ladder to use on a M-15.  I would like one that attaches to the boat via screws.  Thanks