Tube Expanders

[junkyard]

Hi to all, Im seeking some advice as my 1/2" od x 5/16" id copper tubes are weeping in my steel boiler. I am looking to reseal these and have spoken to Wicksteed and due to limited access in the firebox they will need to make a special extended one which is rather expensive to say the least.
Has anyone got one which i may lend or any ideas on how to sove the problem i am encountering.?.?
Thanks

[Snail Trail]

I retubed a steel boiler - copper tube type 7 1/4" Hunslet.

All I did was make 2 very slow tapered drift, grease it well jack the firebox end in and thrape the smokebox end in with a big hammer .

A lot quicker and easier than tube expanders, and non have leaked to date ( Fitted 9 years ago)