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Ralph Mowery

In article ,
says...

Replaced all devices with CoALR and where that was not possible
pigtailed with copper using Marrette ACS wirenuts - the only wirenuts
approved for that purpose in Ontario (No, the Ideal Purple ones are
NOT approved according to my inspector) - I used stranded wire for the
pigtails to reduce stress on the joints when installing the devices in
the boxes.
The electrician that did the job didn't know the inspection would
require the GFCI units to be installed. The inspector gave me a free
permit retroactively for the CoALR and pigtail retrofits which
technically require a licenced electrician (ANY device replacement -
even just changing a lamp or switch- requires a licenced electrician
when Aluminum wiring is involved)
He passed my work with no defects.

I have not seen any, but read there are some compression couplings that
allow you to install pigtails of copper to the aluminum wiring.
It does take a special compression tool as the common compression type
pliers do not have enough force to do the job.