The only two "tricks" I know are to use a plastic insert cut into the blade, or to paint the blade with bright nail enamel ("polish").
If I remember correctly, Brownells sells both plastic sheet from which to cut inserts, and medium-set acrylic liquid that you use to fill a dovetail notch you've cut into the sight. So, both require cutting a notch in the sight blade. I think that the acrylic liquid is easier to use.
Nowadays, I just paint my front sights. The interesting part is that, properly done, the paint lasts almost forever.
I prefer to cut shallow serrations crosswise into the blade, the better to hold the enamel. It's not absolutely necessary, though.
I buy ordinary nail enamel at our local drug store. I use both bright white and "fire-engine red" (scarlet). The ladies at the sales counter, who really do know what I'm going to do, have a lot of fun with me, asking whether the enamel I'm buying will match the shoes I'm planning to wear.
I clean the sight blade with alcohol, degreasing it thoroughly.
Then I paint just the rear-facing surface with the bright white enamel. When it's dry, it gets another coat.
Then it gets two coats of the red enamel. (A heat lamp can speed the drying, but unless you're very careful, you can burn the paint.)
I let it dry for a couple of days.