ASMAIR

I am wondering if anyone can help me with components for Fulgurex point motors. I have four of these on my layout and unfortunately one of the little C shaped springs has dropped out of one of the contact switches. I am looking to obtain a new or broken switch to obtain the spring, perhaps someone knows where the contact switches may be purchased? Any help you can offer would be appreciated.

Has anyone fitted Kadee or similar buckeye couplings to a Heljan O Gauge diesel. Helhan provide a coupling pocket but sourcing a swallow tail Kadee coupling to fit is impossible. Thanks in anticipation.

Can anyone tell me if it is possible and how simple it is to fit a DCC chip and sound chip to the Class 20? If so, where can I obtain insructions?

Excuse me for asking, but being new to O Gauge I have purchased a Heljan Deltic and I am at a loss as to how to fit the plethora of detailing parts to the loco. I have looked at the picture in the accompanying leaflet, but it makes little sense to the contents of the packet. Do some the parts need gluing together before fitting to the loco? Any help would be appreciated. Thank you in anticipitation