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Rivets for downhaul? #149250
07/11/08 12:53 PM
07/11/08 12:53 PM
Joined: Jan 2007
Posts: 71
Lake Norman, NC
Special_Treat_P182 Offline OP
journeyman
Special_Treat_P182  Offline OP
journeyman

Joined: Jan 2007
Posts: 71
Lake Norman, NC
I won't go into the ugly details, but after a stolen mast and finding a replacement, I'm stuck realizing that I never actually looked at how many rivets and what size were used to mount the Harken-392 4:1 double downhaul block set to the mast. (The replacement doesn't have.) I assume you would use monel rivets for an aluminum mast, but how many and what size? I'm thinking four and the biggest that will fit in through the holes?

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Re: Rivets for downhaul? [Re: Special_Treat_P182] #149251
07/11/08 01:01 PM
07/11/08 01:01 PM
Joined: Aug 2005
Posts: 2,921
Michigan
PTP Offline
Carpal Tunnel
PTP  Offline
Carpal Tunnel

Joined: Aug 2005
Posts: 2,921
Michigan
I would use the largest diameter (3/16) monel or SS given that it is probably the highest loaded control line on the boat- maybe aside from maybe the forestay/mainsheet when sheeted in maximum. Even better to use backing plates on the rivets if you can get them up in there after taking off the foot of the mast.

Last edited by PTP; 07/11/08 01:04 PM.
Re: Rivets for downhaul? [Re: Special_Treat_P182] #149252
07/11/08 01:36 PM
07/11/08 01:36 PM
Joined: Jun 2001
Posts: 12,310
South Carolina
Jake Offline
Carpal Tunnel
Jake  Offline
Carpal Tunnel

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Posts: 12,310
South Carolina
most of that hardware is setup for 3/16" rivets.


Jake Kohl
Re: Rivets for downhaul? [Re: Jake] #149253
07/11/08 02:49 PM
07/11/08 02:49 PM
Joined: Jul 2006
Posts: 94
australia
S
self_inflicted Offline
journeyman
self_inflicted  Offline
journeyman
S

Joined: Jul 2006
Posts: 94
australia
I would also suggest 5/32, i have found a lot of fittings use that size as well,
Take the fitting with you to be sure. they should be around 1/2 inch long
Hope this helps Richard

Re: Rivets for downhaul? [Re: Special_Treat_P182] #149254
07/11/08 03:32 PM
07/11/08 03:32 PM
Joined: Jul 2001
Posts: 1,197
Vancouver, BC
Tornado Offline
old hand
Tornado  Offline
old hand

Joined: Jul 2001
Posts: 1,197
Vancouver, BC
Looks like an 8:1 setup...3/16" stainless is fine. The plate itself is stainless, so why bother tracking down/pay for the hard to find/high priced Monel (I've paid ~$7/pop for a 1/4" monel from Murray's) when the stainless plate will also be in contact with your mast?

Just put on a coat of Duralac or TefGel to reduce electrolysis and it'll last 10-15 years.


Mike Dobbs
Tornado CAN 99 "Full Tilt"
Re: Rivets for downhaul? [Re: Special_Treat_P182] #149255
07/14/08 11:58 AM
07/14/08 11:58 AM
Joined: Jan 2007
Posts: 71
Lake Norman, NC
Special_Treat_P182 Offline OP
journeyman
Special_Treat_P182  Offline OP
journeyman

Joined: Jan 2007
Posts: 71
Lake Norman, NC
Thanks all!!!

Re: Rivets for downhaul? [Re: PTP] #149256
07/14/08 03:21 PM
07/14/08 03:21 PM
Joined: Jul 2006
Posts: 1,147
Bay of Islands, NZ
W
warbird Offline
old hand
warbird  Offline
old hand
W

Joined: Jul 2006
Posts: 1,147
Bay of Islands, NZ
Quote
I would use the largest diameter (3/16) monel or SS given that it is probably the highest loaded control line on the boat- maybe aside from maybe the forestay/mainsheet when sheeted in maximum. Even better to use backing plates on the rivets if you can get them up in there after taking off the foot of the mast.


I never use monel because the stuff is so much of a pain to drill. I use alli and have never been let down by it. You are talking sheer strength here and anything more than alli is over engineering and if you do need to remove or replace causes monel problems.


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