Hey Henry,
Not offering a trade but, I have among a number of other scopes a little 130mm Vixen Newtonian.
It's an F5, holds it's collimation extremely well & provides me with some absolutely stunning views...
It's not a huge scope either when compared with the little 127mm Mak you have at 650mm long overall & it is very lightweight.
It's providing me with some lovely wide.. ish field views & when recently viewing the moon & really pushing the magnification (2.5mm EP) the views were in my opinion, simply gob smacking...
I got mine secondhand through a forum member & it has been modified with the addition of a 2 speed crayford focuser; I believe it comes with a single speed focuser stock...
Whilst I do use mine for imaging on an EQ mount, I also use it on a GSO Skyview deluxe manual Alt/Az mount & it is quite frankly a joy to use...
TFOV for comparison with say a 20mm, 1.25" Plossl is 1.3 degrees, 40mm 1.25" Plossl around 3 degrees..
If you can get your hands on one of these, I suspect neither you or your children will be disappointed...
