Need Recommendation for Best Glue--Brass to Plastic

Most any super glue.  (CA)  Cyanoacrylate.  There are different thicknesses and different set times from Thin to Thick.     

...to which I would only add

 

1)that the parts should be clean to the parent material, and...

 

2)the fit should put as much surface into contact as possible.  (e.g., two flat surfaces, close-fitting peg-in-hole, etc.)

 

I'll add that if you can make use a bit of the casting sprue on smaller details placed into a drilled hole for added strength, that will go a long ways for keeping parts such as these attached.

Thanks for replying so quickly, guys!  What is the best method to apply CA?  Do you apply a thin layer to each surface and THEN join them together, or do you hold the parts together and then apply the CA allowing it to be drawn into the joint?

Thin set CA is pretty aggressive.  I usually dab a small drop on a piece of wax paper, or similar surface, then use a small brass wire.  Dip the brass wire in the CA and then touch the CA to the detail piece.   Install, it should set in place quickly.  Medium thickness/set  allows for more work time, but as the viscosity goes up, it becomes sloppy, IMO.  You may want to practice, I never had any luck applying directly from the bottle, even though they normally have long pointed tubes for application.   Mike

I prefer the gap filling CA that's a thin gel for some of these things, it stays where you put it much better than the liquid.  The liquid runs all over the place.

Gorilla Glue "Superglue" has some pliability and is a medium set CA.  Locktite has gel CA that has a slow/medium set capability.  The Locktite stuff also works well with accelerant/freeze compounds.  The rubber additives in the Gorilla Glue not so much.  I've used both and for what you are talking about doing the Gorilla product may have a slight edge in terms or durability but may be more difficult to use.

I've been getting really good results from Gorilla CA glue gel. It's easy to find (Lowes or even Rite Aid) and the gel makes it very easy to control. A tiny drop applied, hold for 10 seconds.....works well.