TOPIC:

Amendment: I screwed-up when I cut the brass and silicone for the picture. Sorry 'bout that. Reverse the lengths !!!!! The exact lengths are not critical but the brass tube must be longer then the silicone tubing so that at least 1mm on each end extends past the silicone .!!!! Neither can extend into the choke-piston well (for obvious reasons) !
Reverse the lengths !!!

So... where is that hobby model store again? Need to get that silicone tubing LOL

Both are 10 mm in length, so cutting off about 2 mm off the silicone tubing will make it right I assume, right?
I get it - the silicone is to seal and keep the tube 'restrictor' in place, and both are just pressed in.

That's correct Stan !