Hi Robbin, Follow this link:http://www.48north.com/mr_offline/denaming.htm Have you read any of John's books? He is very entertaining and knowledgable. I have a few thoughts about your tabernacle and cracked sole.It may be possible that the rigging on your M23 may have been overtightened or stressed at some point. I think it happened to my M23 as well.The former owner Dick Lane noticed this and rebuilt the top deck and added support. On my boat, the deck under the tabernacle has been replaced in a small section, the tabernacle moved aft a few inches, and a thick metal plate has been added inside the boat at the top of the compression post.Perhaps in the original build the deck was a bit too thin for the mast loading. I can take some pictures if you wish..... Happy sailing! Bones ____________________________________________________________ Groupon™ Official Site 1 ridiculously huge coupon a day. Get 50-90% off your city's best! http://thirdpartyoffers.juno.com/TGL3141/4df0c400b8fd02eeb18st06vuc