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As @Fergie 307 has already deduced, I now suspect that it is 14tpi. Here is a blow up with suggested dimensions :- The Yellow lines show a 60° form (Unified) and the Purple lines 55° Whit form. The dimensions are anotated in mm after enlarging the photo so that the OD is 207.5mm (ie. a 10X...

I've just found the last image which might be useful.

At least you have recognised that those photo's don't help much. 😂 The ideal would be a close-up (say from 25mm away) - square on - showing a clear thread-form but even one taken from (say) 120 or 150mm distance - as long as it is square on - could be useful, the inclusion of a ruler is...

Agreed. I would suggest Pirana Pine as a highly likely candidate.

With the confidence expressed in 20.75mm OD it would be unlikely to be a 22mm thread which is well 'undersize'. The Pitch dia. of a 22 x 2 ISO thread would be 20.663 - 20.70 so even a cursory viewing would show that the thread was very shallow. 13/16 is also unlikely (though not impossible)...

No problem. Dobbies is only about 5 minutes drive away and I pass it at least 3 times a week - I don't often actually visit though.

News from 'the horse's mouth' as it were - - - I've spoken to a young man at Dobbie's who's responsibility it is to deal with any stock of this type and he confirmes that he has never seen such at Atherstone in the 5+ years he's been there. He can also confirm that there was a manager with the...

It so happens that I live in Atherstone and will probably have to go past Dobbie's today. I have copied the original photo to my phone so I'll make a point of calling in to check whether there is a 'Helen' and if they do actually have stock. I'll get back - but don't hold your breath . . ...

For the sake of accuracy, the British Standard BS84-1956 which covers BSW & BSF threads does not list 5/32 in either series. In fact there are no '32nds' listed in BSW but, oddly, 7/32 & 9/32 are listed in BSF though they are non-prefered and (to be honest) add little to this discussion. There...

M22 would be 2.5 or 1.5mm pitch - so 'non-standard' but certainly possible to manufacture. 2mm pitch doesn't appear in the standard 'fine' series until 24mm and the cource series at 14 & 16mm. 20.75mm is very close to 13/16" (0.0044" larger) and the only 'standard' I can find for that dia. is...

As ever - a beautifully created piece. I have only ever heard of a 'Catalina' through playing the part of Bob McCaffery in South Pacific so your thread tittle immediately took me back to 1976 !! Even then I never knew what one looked like.

You do, of course, mean Concave (or hollow') grind @deema

I've done a far amount of just that so strongly recommend any exotic hardwood. I particularly favour Cocobolo - though any of the various Rosewoods, if you can ever source any, are worthwhile as would be Snakewood or, for a lighter (visually) option, Masur Birch. Even Zebra Wood for slightly...

Velvet would have been used in the finest sets by the likes of Riefler. 'Flocking' is simply a poor-man's imitation used to keep costs down. The outside of the very finest sets could well have been Shagreen but Calf-skin would also have been used.

If you wish to 'make a job' of it - avoid 'flocking' like the plague! Buy the best Velvet you can find - difficult but available if you dig really deep - is 100% silk. The last I bought (for a pen box) cost me ~ £25 a Sq. Yd. but you will only need a 'Remnant'. 50% and 20% silk are easier to...

It's not 'About' 12.7 tpi - it's exactly 12.7tpi - nor is it 'non-standard' - DIN 103-4 lists 16mm x 2mm Trapizoidal as in the 'Extra Fine' Series. From the information provided to date, it appears to be 16 x 2 but with a reduced OD which may well be acceptable since the OD is not the...

The difference between 5/8" & 16mm is in fact only .0049" I had considered that this might be a 'Trapizoudal' thread and therefore 16mm OD x 2mm pitch but having re-visited the latest image I'm not convinced. Recognising that the OD could well be undersize I made the image exact as to 20mm...

A good clean up and a new photo would help . . . . . New photo arrived - - - I was about to say that if that is 5/8 Ø then it is a 12½ TPI - utterly non-standard even for an ACME thread - and they can be weird. The new photo - with the rule for scaling - nearly confirms my previous...

Brilliant piece of kit! I fitted one when I re-furbed my kitchen about 8 years ago.

Straight copy from Wiki - - - From earlier wonnot, from Middle English wynnot, wilnot, wolnot, wilnat, a contraction of Middle English will not, wil not, wyll not, will noght, wil noht, willi noȝt, wyl nat, wol not, woll not, wole not, wolle not, wol nat, woll nat, etc., equivalent to a will...