The rest of the weekend went by in a whirlwind of family activities as usual, but I did carve out a few hours on Sunday to start dry mounting the lifeline stanchions. By dry mounting, I mean that I tapped and fitted them but didn't fasten them permanently with butyl tape (the sealant I'll be using for most deck fittings) because I want to get some paint on the underside of the decks before I permanently mount them. I had recently ordered $100 worth of 2-1/2" Silicon Bronze screws, washers, and nuts and wanted to see them installed.
|Bevel with countersink bit|
A little trimming here and there allowed me to seat it, but for the rest of the stanchions my procedure went as follows:
- Place the stanchion on deck at desired locations.
- Tap all 4 holes in deck using stanchion as guide (5/16" bit).
- Chamfer the edge of each hole by overdrilling with a countersink bit to allow for a slight bevel (see bevel photo). This serves to reduce stress related fractures in deck when stanchion is put under load and allows a ring for butyl tape to bed nicely into.
- Tap one hole in backing plate and mount tight on underside of deck, making sure that it is positioned properly.
- Tap remaining 3 holes in backing plate from the deck, using the mounted stanchion as a guide.
- Fit bolts in stanchion and add washer and nut.
|I still have to paint and remove the old fasteners before I permanently mount the stanchions.|