Air Nozzle

Ordered new nozzle used the heat gun to soften the end connector and with light pressure pressed on to the air pump. Back in business . Less then 5 minutes to repair

Put the housing in a vise and gently heat it up. The temperature was under 200F but I could not determine the exact temperature. Once it is heated up push the plastic hose over the air pump cap. It popped right on after heating it. Let the metal cool before putting it on the scroll saw.

I carefully heated the end of the nozzle with one lit match. This created enough flexibility in the nozzle so that it easily pushed on the knob.

Part is not going to snap on as expected,Very brittle and cracks easily.Best way to approach it is to use a heat gun to soften the plastic and nudge it on carefully

Removed old knob & replaced with new.
Tried hair dryer to heat up hose end so it would slide over the air knob...Not good. Boiled water and let the end of new hose soak for about 5 minutes. Slipped hose over air knob.
Hair dryer doesn't get hot enough to soften the plastic.

Heat up the end coupling and press it on the air pump cap

Heat up the last segment of the air nozzle, until it is pliable enough to be pressed on the air pump cap. Let id cool down. And you're done

Ordered and received replacement from ereplacementparts dot com-- quick shipping and delivery of the correct part that I selected from the website's exploded parts view and parts list. Difficulty is that the inside diameter of the black plastic female link has to slide over the larger round metal ball-shaped nipple where the air comes out, and the ID of the link is smaller. How to install, is the Q. Online search suggested heating the female end by soaking in hot water-- this did not work at all for me. Further searching, one person suggested this method, which did work quickly and easily: Remove on last link of black plastic from the multi-link air nozzle. You now have a single-link. Carefully place the female part of the single-link against the round metal nipple (the male part attached to the DeWalt). Hold in place then strike the black plastic piece using a rubber mallet. I started with a gentle tap then progressed with harder taps until the female slipped over the largest part of the ball-shaped. Then work the rest of the hose onto the single-link, and you are done!

First I just tried forcing the new one on the scroll saw. That didn't work.
I took my heat gun and heated the end for about 15 seconds and then the hose just popped on.

Removed blade from the saw , tipped assembly back and braced it, removed the air pump cap by removing two torx screws holding the cap.
Installed the new air pump cap, then GENTLY heated the air nozzle end, so it would snap back onto the air pump cap fitting. Allowed the assemble to cool, reinstall a new blade and then ready to go again.