Hey Lads,
I'm back off me hols and I look at the website reguarly, so you are not by yourselves!
Undercarts, eh................
Depends on your model and the fragility of the real thing. In 'scale' it is hard to make fine plastic bits as strong as the the high tensile steels/metals used in undercarriages in the real world.
if possible, replace them with replacments from aftermarket companies like SAC who do a good selection in 'metal' which are more robust than the plastic originals in the kit.
Otherwise, try not to subject your model to too much stress, whilst transporting, etc. I tend to support my models so they are off the undercart whilst being moved, and only allow them to 'sit' on their undercarts when on display.
Drilling out undercarriage legsmight be another 'cheaper' option, but you need a really steady hand and strong pins to insert, and then judicious use of superglue and accelerator to complete. If you can replace, if not reinforce, if not transport better, or why not put model on a stand and have it in flying mode??
Bigkev