Hello Bob. I am looking for the same information for my 1976 M17. Sounds like we have the same windows. In fact, I just tried to post (about 45 minutes ago) fairly similar questions but, once again, received a “mail delivery failed” notice. This happens every time I try to post to this group. Did you see my post, or is this just a coincidence? I just can’t seem to send a e-mail successfully to the Montgomery Group. So I have used the reply option and got in trouble for not changing the subject. I have the address as: ‘montgomery_boats@mailman.xmission.com’ Do I have something wrong? I have checked out the two helpful links you provided about the window and I have also seen Dave Scobie’s reply. I will follow up on that info as well. Thanks. Sent from Mail for Windows 10 From: Rob Bultman Sent: Saturday, March 27, 2021 11:33 AM To: For and about Montgomery Sailboats Subject: M_Boats: Window Glazing Material Hello Folks, I have a leaky port window on my 1977 M17. These windows have the two-part aluminum frame with the exterior frame holding the "glass" and an inner frame which screws into the exterior frame from the inside, holding the window in place. I managed to get the window out of the hull and the "glass" out of the frame. The window glazing that holds the glass to the frame is very brittle and in one location completely gone. The exterior frame that holds the glass has a single cut in the frame that allowed the window to be removed with a little force applied to open frame. I'm looking for a replacement for the window glazing. Is there a recommended source for this? Would something like this work? https://www.amazon.com/Gray-Glazing-Vinyl-Glass-Thickness/dp/B00O8ZUM6K?th=1 I also saw this kit from Catalina. https://www.catalinadirect.com/shop-by-boat/catalina-25/hatches-ports/gasket... If the glazing is not a watertight seal and some sealant is still required, I don't know how I could seal it without making a huge mess, given that the window frame is a single piece with the one slit. At this point I'd like to retain the original aluminum frames and window, but I'm open to suggestions. I've seen the replacement project on Audasea on the photo site. I saw another (non-M boat) where spacers were used to push the window away from the outer edge and butyl caulk used as glazing and sealant in the space created by the spaces. (I think the spacers were temporary.) Thanks in advance for responses. Regards, Rob M17 FIN