It's okayish for light loads (lazyjack cleats) that don't get undone regularly. I have tapped a mast on a friends boat, but it wasn't my preference (guy sent to fetch the rivets had the wrong length and they were heading off soon). If there's no way to rivet it instead, make very sure you apply some silicone grease every single time you put those bolts back in, else the corrosion will gnaw off the alu threads (the screws are presumably stainless steel). One that you actually have room to turn! On a mast there is usually lots of kit interfering with turning a wide handle, so you often end up using something smaller, or the already mentioned drill chuck. Works sufficiently fine with some care (i.e. This is the kit I've got on board and used. As long as its not total crap and will snap right off, pretty much any will do. Cheaper kits only have one type, and work fine in this situation (soft metal, through-hole). No, just increases the chance of snapping off the tap. Use cutting oil/spray and a rag to collect the filings before they're tread permanently into the deck.Ģ. Aluminium is soft, so easy to drill, but also easy to make an oval out of with a dull bit. Doesn't matter what the bit is made of, but it must be sharp. Sorry if this is a bit OTT but if I make a hash of it, I imagine I would need a pretty expensive mast repair (if that is possible).ġ.
What is the best type of T-handle to use, bearing in mind I probably won't use it again. How critical is the quality of the tap - does £5 or £6 sound about right?Ħ. I understand taps come in three types, taper, plug and bottoming I know I don't need the last one but can I start a clean thread with the intermediate one alone?ĥ. Is M5 normally 0.8 thread pitch or is it possible Selden use something coarser/finer?Ĥ. 4.0mm, would i reduce my risk of oversizing the hole for the tap?ģ. For a clean hole in aluminium would you use an HSS, Tn or Cobalt bit?Ģ. The Selden instructions say use a 4.2mm drill and an M5 tap. I have zero experience of this and no general metalworking skills as evidenced by my attempts at drilling out rivets. Having decided to go for a screw in sail entry gate I'm going to have make a couple of threaded holes in the aluminium mast.
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