[ausastronomer (John Bambury)]

If he moves the secondary down the tube he will also need to move the focuser the same distance down the tube. This will move the focal point out by the amount the secondary and focuser have moved down the tube. Whilst it might allow him to reach focus it will do a really good job of hacking up and uglying up his perfectly good telescope leaving an ugly gaping hole and 4 small holes where the focuser used to be. A far better way to do it would be to dock the bottom off the bottom tube and move the whole mirror cell up. This can be done without leaving any ugly scars.

However, if its a reasonably new scope I would be sending it back and getting one that reaches focus properly. You shouldn't need to modify a telescope you have paid good money for.

Cheers
John B