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Visionary Mira Ceti 150 - help needed


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I have bought an old and dirty Visionary Mira Ceti off eBay, in the hopes I can clean it up and give it a new lease of life. 
So far, I’ve taken it to bits and cleaned the parts, the mirrors took some polishing but are now OK (some small blemishes I can live with).

However the part that connects eyepieces with the focus tube is missing and I’m not sure what I need to but to replace it. The focus tube measures about 40mm across. 
Is this a T-thread on the end of the focus tube? 
 

Many thanks in advance!

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40 minutes ago, Fraser G said:

Is this a T-thread on the end of the focus tube? 

Most likely it is, but you can measure it if you have calipers.

It needs to be 42mm outer diameter on thread and 0.75mm pitch (distance between thread peaks).

If it is - you'll need T2 - 1.25" adapter like this one:

https://www.firstlightoptics.com/adapters/baader-125-t2-eyepiece-holder.html

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