Thanks for the quick and very helpful reply. The dimensions are close to what I was already looking at. From digging around the intyweb, it seems the 8041 & 8042 are discontinued Craftool products. Ill keep looking though.
However, failing that, there are some pretty close versions from a place called Goods Japan. They sell high quality tools including "lacing chisels" - i.e. flat bladed like yours. These things don't just mark hole positions, you can punch straight through the leather. (Unlike "Pricking irons)
The Japanese products are metric by design and from your measurements, I'm guessing yours are imperial - about 3/32" wide. So I have to choose between the following sizes;
Option 1 -- 2mm prong with 2mm gap
Option 2 -- 3mm prong with 3mm gap
The only problem is they dont give the blade thickness - like the 1.8mm in your case.
On the Goods Japan website there is a menu of forks to choose from and when an item is selected, e.g., Craft Cha 4x2mm it shows written details and also a video shows the piercing being done and compares the results of using different fork specs, like here; (Apologies in advance for the groovy music)
http://goodsjapan.com/craft-sha-leather-lacing-chisel-leathercraft-tool-for-thonging-4x2mm-183-p.asp
Of the holes being made in that video example, the 3mm holes on the left look more like a slit than a rectangular hole.
The 2mm fork doing the holes on the right, looks a little smaller than yours, but looks in proportion to yours - if that makes sense
.so in view of that I'll go with the 2mm forks and hope for the best
Finding 1mm waxed thread is no problem. However, finding Weaver thread is not so easy here and they want $60 for a reel sent across the pond..again, shipping charges killing us here in England. I will find find something though, probably try that Tiger" thread - it gets rave reviews and they do it in 1mm waxed polyester..as you suggested
Finally, what do you call that grained surface texture on your Tan coloured Buck 110 sheath?.. and which part of the cow does it come from?... sorry, ignorance strikes again..
All this research for a first sheath, eh?
.I ask ya. Ill post a pic when its done if Im not too embarrassed.
Anyway, once again, many thanks for your time and help, youre a gent!
Kind regards
Pete