Elbow to Weber Carb adaptor.

So I decided to strip down my oil bath air filter and give it the once over, was surprised at how good it was inside, I did however notice that the elbow that fits onto the i carb intake is a rattling good fit, does anyone know of anywhere that makes an adaptor for if or am I just as well using a bit of PTFE to make it air tight.

try https://www.hnjengineering.co.uk/pages/products/hnj2286su4cyl/hnj2286su4cyl.html