Severne Lockjaw Boom Head

6 years ago
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segler
segler
WA
1663 posts
WA, 1663 posts
14 Feb 2020 7:06am
What size of monocoque boom tube diameter does this Lockjaw boom head fit onto? I am thinking of retrofitting a HPL 160 carbon boom.

I have done these retrofits to HPL booms before, installing Maui Sails SDM boom heads. They work really well, but they don't make a RDM version, and I don't like to keep losing shims.
segler
segler
WA
1663 posts
WA, 1663 posts
15 Feb 2020 3:03am
More on this.

Maui Sails retrofit boom head comes with shims to fit 36 mm and 40 mm tubes.

Chinook retrofit boom head fits on 33.5 mm tubes.

What tube diameter does the Severne Lockjaw fit on?
JakeNN
JakeNN
372 posts
372 posts
15 Feb 2020 3:32pm
I tried extensive research for a retrofit ... I wouldn't waste your time.

Don't forget to check:
1. slight curves on tubes;
2. angles at each end of boom head;
3. changes in diameter across tubes
4. diameter as you said

I checked everything, bought a new head, spent ages with minor sanding to get a perfect fit .. never really worked.

Tolerances are tighter than you expect.
mkseven
mkseven
QLD
2315 posts
QLD, 2315 posts
16 Feb 2020 8:44am
Wave 32mm diameter, 88mm width.
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