It is possible that it was a special, but I suspect not. Colchester always tried for standardisation, probably to help their export market. I would check out the threads of the right pitch, close to those measurements. 5/8 CEI and I believe a couple of other less common ones in that same area. Plus there is an M16 in the 1mm series, which would be close to pitch, (I suspect that your OD and ID in your message are transposed.) Alan ----- Original Message ----- From: "Barrie Purslow" <bpduo@xxxxxxxxxxxxx> To: <modeleng@xxxxxxxxxxxxx> Sent: Friday, August 11, 2006 7:25 PM Subject: [modeleng] Mystery Thread I hesitate to raise a new topic since my last effort resulted in a debate of such intensity that one of our erstwhile members was driven to drink ( Good luck with the rehab. Harry). However - here goes:- The collet drawbar on my trusty Colchester Chipmaster has just stripped and I am having great difficulty in identifying the (female) thread. The collets are Boxford 327(5C) type and the thread measures 0.598ins. O.D. and 0.632 ins. I.D. It is 26 tpi. Solve the mystery and I promise never to mention the word "accidents" on this forum ever again! Regards, Barrie ----- Original Message ----- From: "Harry Wade" <hww@xxxxxxxx> To: <modeleng@xxxxxxxxxxxxx> Sent: Thursday, August 10, 2006 8:18 PM Subject: [modeleng] Accidents > Gentlemen, > To remain topical, we should all be mindful that as with loco driving, > or train operations in general, pints and workshop activity do not mix. > To > that end I plan not enter the workshop after sampling some of what has > just > now arrived in my post box, . . . . two pints of "Bishops Finger" Kentish > strong ale. A report on my findings in due time. > > > Regards, > Harry Wade > Nashville Tennessee > > MODEL ENGINEERING DISCUSSION LIST. > > To UNSUBSCRIBE from this list, send a blank email to, > modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject > line. > > > > -- > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.1.394 / Virus Database: 268.10.7/409 - Release Date: 04/08/2006 > > MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line. -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.1.405 / Virus Database: 268.10.9/416 - Release Date: 10/08/2006 MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.