i have read some where that it is possible to upgrade the internals to make them work as a decent fork i.e air spring the right hand side and nitrogen charge the left hand for damping
i am not sure if this is right or possible

Dj3 was a cheap tough fork with basic damper. Even dj1 was not sophisticated in terms of damping. If the fork is used, the inside of the stanchions would be marked from contact with coil spring rendering it impossible to fit an air spring because the spring head seals would leak

I have a Dirt Jumper 1 for sale – £100. Used it as an all round fork for my 100mm bike as I’m no dirt jumper myself.

Tom KP