Richardtr3a Posted March 28, 2021 Report Share Posted March 28, 2021 I am looking for wing nuts to replace the knurled nut that holds the instruments in the TR3 dashboard. My supplier has my pattern and has advised that it is a metric thread. How did that happen in 1958 ?? Quote Link to post Share on other sites
BlueTR3A-5EKT Posted March 28, 2021 Report Share Posted March 28, 2021 (edited) Deleted Edited March 28, 2021 by BlueTR3A-5EKT Wrong info initially Quote Link to post Share on other sites
Icarus60 Posted March 28, 2021 Report Share Posted March 28, 2021 You could try using M5 whilst you save up! Quote Link to post Share on other sites
BlueTR3A-5EKT Posted March 28, 2021 Report Share Posted March 28, 2021 9 hours ago, Richardtr3a said: I am looking for wing nuts to replace the knurled nut that holds the instruments in the TR3 dashboard. My supplier has my pattern and has advised that it is a metric thread. How did that happen in 1958 ?? Done to stop British motorists popping down the road to an iron mongers for replacements probably. Same happens with old British bicycle threads Quote Link to post Share on other sites
BlueTR3A-5EKT Posted March 28, 2021 Report Share Posted March 28, 2021 (edited) Here you go. Metric wing nuts off the shelf. is it the 2 big instruments or 4 small ones? Perhaps the small instruments use 3BA threaded thumb nuts.like MGA of same era. http://mgaguru.com/mgtech/dash/dt107.htm Moss say 4 or 5 mm stud size. https://www.ebay.co.uk/itm/M3-M4-M5-M6-M8-M10-M12-WING-BUTTERFLY-NUTS-TO-FIT-BOLTS-SCREWS-BZP-GRD-4-DIN-315/383706164434?_trkparms=ispr%3D1&hash=item5956ab6cd2:g:lNkAAOSw8d1fUhep&amdata=enc%3AAQAFAAACcBaobrjLl8XobRIiIML1V4Imu%2Fn%2BzU5L90Z278x5ickkxFtV7J5P58ubuVigtBH%2Fe2S63aUft2mSz4yTtinuS86YoLxZiNEbtuC7i3%2FsdhtW%2Bbp6GLwNFXLQ%2BG6ZZPuoaay%2F%2BUHdLJQE%2BmY4sWo76Smy813g5iZ%2Fb01Udd2wpDC3p9l6MGC9HBzHYi%2BksDYGp%2FWa%2BVRajFRfLz67g5oxKTXhVIK6HVaOplCsXIx20%2BYHvYFo7o39%2B3nx66FYu3Q6KWPtPKPT5G9i7c9T1iyicajAu1Zyw%2B2UvdguVRpB%2FapdiMgJZ%2B6oEv8pFv817JDkzJ2As1RgsfR676mu6I687jWIz2NTyRTeytkpXZJ%2BP2Wh766Y8CTEemIwDEDTwh1EjfQ6QXajgWvoHU%2Fn4TUbIBjHfdqZJvLzLqjjrWQlJ5myiL5oo%2BGOXcdYWOe9u%2BO1FKueOsryMzvv7ULr%2F3leSRC5sgd9H61%2B4e6EjY%2FDkpKWj%2F0U6UQw93Rp51RZv9fL4LB%2FPvI0xkqyuWk0nOZP6FNPDmNmteCnTGZIrOGV74JwF%2BQGz1gvPeASFi58qp9ThbWfZ6RgrgQHfwWKiU3WQGUhjx6eSQ2TZbHPZp4AddKi4Z%2BqhNZvT%2BehB85O4EqHLpjapeJYRdao6y8Mc%2Fk9gtC1g5LvsFllnukn926sQoF0QK%2BBjZ5hUbIOf%2F0ed%2FlpDWE%2Bb6x4cshFf1uwNfAt2VC1i9qlS7lkZ9ebLMQcAsu4y8aiaR53sKXJx9K3lEVLKWwb6WrBf2hk5iQ5EytGKQBeesrJn%2Bb8CKtNUogtHRDEaaAfTMQncePkgmA8m8T36A%3D%3D|cksum%3A38370616443473013b7895e24dd6b702e00b916c2883|ampid%3APL_CLK|clp%3A2334524 Edited March 28, 2021 by BlueTR3A-5EKT Quote Link to post Share on other sites
Richardtr3a Posted April 1, 2021 Author Report Share Posted April 1, 2021 Thanks Peter, I found some stainless steel wing nuts in M4 which were £1.75 delivered for 10. from Kayfast Ltd in Wakefield. They were supposed to arrive before Tuesday and were delivered today by the postman. Great value, quality product but will not fit the thread on the fuel gauge. It will start but only about 1 turn. How can we find the real thread ??? Richard & B Quote Link to post Share on other sites
Grahamgl Posted April 1, 2021 Report Share Posted April 1, 2021 Richard, Until Roger H comes along, I would suggest that you run a 2BA tap through one of your wing nuts. This is the size on my 4. Graham Quote Link to post Share on other sites
NCS_TR3A Posted April 1, 2021 Report Share Posted April 1, 2021 (edited) Mine were definately a BA thread. I thought they were 3BA but that would be about 3.9mm shaft, 2BA is 4. 5mm shaft so based on your M4 nuts only going on a turn its probably a 3BA. I couldn't find a wing nut in BA when I was looking so I tapped them. A lot easier with wing nuts, just don't over tighten. Neil Edited April 1, 2021 by NCS_TR3A Quote Link to post Share on other sites
NCS_TR3A Posted April 1, 2021 Report Share Posted April 1, 2021 (edited) Looking on ebay there seems to be a lot of 2BA instrument nuts, although there is one that's M5 x 0.75 tread (which is slight odd as M5 is 0.8) so I might have totally the wrong memory on this Edited April 1, 2021 by NCS_TR3A Quote Link to post Share on other sites
NCS_TR3A Posted April 1, 2021 Report Share Posted April 1, 2021 (edited) Sorry to add yet another post but I went looking for the answer rather than relying on memory. I quite often use SC parts site for things like this as they tend to tell you the thread on the items unlike Moss. https://www.scparts.co.uk/sc_en/british-cars/triumph/triumph-tr2-to-tr4a-1953-1967/electrics-ignition-system-heating-and-dashboard/instruments-tr2-tr3-tr3a-and-tr3b.html Based on this it should be a 3BA which is what I remember mine being as well. Neil Edited April 1, 2021 by NCS_TR3A Quote Link to post Share on other sites
Richardtr3a Posted April 1, 2021 Author Report Share Posted April 1, 2021 That is very helpful. I do not use SC parts but will consider it now. It is very useful to have the description. Thanks Richard & B Quote Link to post Share on other sites
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