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Yeah, there is no way that my tube is 700mm. Actual length is 517mm, tip to tip. I reckon that it is about 350-355mm from primary to secondary, which with the barlow in the focuser (which was found easily enough), would give close to 1400mm, f/9 characteristics.
Now ... if I were to get an F/5 Bintel Parabolic primary ...theoretically, I should be able to modify this scope with minor minor adjustments, albeit halving any magnification in he process. I'm talking about adjusting the position of the secondary by a few mm, to accommodate for the new focal length.
This would then allow me to do away with the in-line barlow, and have a short-tube F/5 scope.
Any holes in my argument so far?
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