I recently bought a Railking GP-20 and was going to add smoke fluid, but the exhaust has a grill which can’t be removed. I have an MTH U30C that has a similar setup. I use a 23 gauge syringe to fill the U30C (1ml = 20 drops), but the syringe won’t fit through the GP-20 grill without bending the bars a bit. I suppose I could just add drops on top of the grill, but that seems like just asking for a mess. I guess I’ll head off to the drug store to get a syringe with a finer gauge needle.