Here's a site that describes the different iterations/clones:
http://star-firearms.com/firearms/guns/d/
Surprisingly, the Colt Pony used a Star slide & components. Perhaps some Colt parts can be located?
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Colt did a lot of business with Astra. Astra manufactured the Colt Junior until the 1968 Gun control Act.
Also, good to hear about the Astra being fixed. I've always loved these Spanish guns but they can be a trip to work on. Especially the Ruby's.