compressed expansions

A major concern for me was the whole topic of the expansion chambers, firstly sourcing a set and secondly fitting them with the non native frame present.
I managed to source a set from a forum member on RDnuts . they are a pair of early Microns under the name "Codnor Micron" with short can silencers. They have been  involved in a meeting with a foreign object at the diffuser point and need to be repaired.