Hobies typically had 3/16" Monel rivets on most mast and boom fittings. There were some 1/4" rivets on the crossbars and some 3/16" flathead rivets in the rear traveler track. Monel rivets are slightly harder than stainless so a sharp drill and a steady hand are required. Also a good pop riveting tool is needed to pull the Monel rivets. I can pull aluminum ones all day long, but one or two Monel rivets do me in. As the Hobie can capsize, any fittings replaced on the mast or boom should be sealed with RTV (rivets also) to keep the mast from taking on water in the event of a capsize. Not something us monohull sailors consider too much! Hope this helps. Former Hobie sailor Steve Shenkel <>< _/) M 17 # 263 Glendale, AZ -----Original Message----- From: montgomery_boats-bounces+slsail=cox.net@mailman.xmission.com [mailto:montgomery_boats-bounces+slsail=cox.net@mailman.xmission.com] On Behalf Of Bobbie Mayer Sent: Tuesday, July 25, 2006 1:31 PM To: montgomery_boats@mailman.xmission.com Subject: M_Boats: removing rivets No M content= H instead. My sister is trying to replace a part on an old Hobie 16, and needs to remove old rivets. How can she do this? Bobbie _______________________________________________ http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats