I think that Tom Heller bought out the Mauser spare parts when they closed things down. Check with him to see if he has the mainspring guide.
When you reinstall the guide, there should be a hole in the base of the guide. I use a screwdriver through that hole to get added leverage during compression of the spring. It wasn't that difficult to compress and control.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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