The tap itself is very robust the new ones from Gardiners are better than the old model. What do you mean is fragile?
Is it the red plastic inserts? They are so easy to damage and impossible to fix if the little springy thing pops out.
The best way to make them more robust is to use the 8mm John Guest insert with 6mm barb.
I wrap mine round with several wraps of insulating tape to prevent them pulling out - they last for ages with no problems.