need help determining what is the best method to repair a crack in 21 g sheet metal

[tonkarob]

Hi I restore old toy trucks form the 50s and 60s and occasionally have a crack, split or tab that is broken off and was wondering what is the best method to repair these without warping,etc. As with the tabs they are slid through slots then bent over to hold pieces together so the repair there will need to be able to be bent over one time.
Thanks,Robert

 

[the snooper]

probably silver solder standard solder may be a little soft but you could try it nothing to lose