This is the spark arrester of an 009 gauge Porter, which consist of the following 4 parts:
It only fits the new chassis of the Minitrains 'Krauss Steam Locomotive', which is also being sold separately at www.minitrains.eu.
The spark arrester has been designed to fit the K&S Engineering 3.5 mm thin wall tubing ,with a 0.25 mm wall thickness. A piece of this tubing can be used to build the smokestack, which can be fitted with an M2 bolt on top of the smokebox of the main body. This bolt also fits the main body tight in place and connects both the frontbeam and cylinders to the chassis.
In the example model in the picture, an M2x30 bolt(www.krick-modell.de) was used together with a 9.1 mm piece of K&S Engineering 3.5 mm thin wall tubing, to create the smoke stack and to fit it to the main body.