KaP2011 and Erans, thank you for your comments. It gives me peace of mind in this case.
Erans, regarding building new ones of stainless steel, its a good suggestion but my tools are limited and. In fact, I build my airmodels on my dinning table.
But I will look with the hobby shops I have around here in Dubai. Maybe they can help on this! To replace at least the ones that there is no access to change if required.
Cheers!