If the threads are stripped, you will also need the epoxy kit offered below. Fill the old hole in the deck and compression post with the epoxy and let it cure. Re-drill the hole and mount the new mast step using the sealant suggested below. Regardless if the threads are stripped or not, remember to drill a pilot hole deep enough to accommodate the 3-1/2" long lag screw. Installing the longer lag screw without the appropriate pilot hole might split the teak.

To prevent galling, lubricate all stainless steel threads with a thread lubricant like the one we offer below under "May we also suggest".