Tried and True SE Heavy Breather external breather modification.

[No Cents]

  braided stainless

[Johnwesley]

I don't drill the holes out for threaded nipples any more.

I just drill them to take a 1/4 inch barb fitting and drive it in with some epoxy on it.  The fitting 1s a little union Home Depot sells to join 1/4 plastic tube.  I just cut all but one barb off the end going in the hole.  Works like a champ and way cheaper than threaded hose nipples.

I also like to use clear tube and route the rear over the top, so I can look down and see what its passing. 

And the OP mentioned drilling the support plates to 1/8th inch.  I get better results at 3/16 with a deep chamfer. 

Decided to use your interference fit idea and it's working well. A little epoxy for reassurance.

[Coyote]

Only takes 10 mins to tap them. 

[98fxstc]

I don't drill the holes out for threaded nipples any more.

I just drill them to take a 1/4 inch barb fitting and drive it in with some epoxy on it.  The fitting 1s a little union Home Depot sells to join 1/4 plastic tube.  I just cut all but one barb off the end going in the hole.  Works like a champ and way cheaper than threaded hose nipples.

I also like to use clear tube and route the rear over the top, so I can look down and see what its passing. 

And the OP mentioned drilling the support plates to 1/8th inch.  I get better results at 3/16 with a deep chamfer. 

Good idea to use clear if routing over the top to see what is not passing