FWB 124 spring whatsit

When I got it the seal was crumbly Bazooka Joe/wax. Replaced with a fitted JM seal. I don't know where the spring is from. 35 coils of .128 and .570 inside. Put it together and it had some light vibration (expected). The guide is .550. No real way to make a guide for it without modifying the original (I don't want to do that) so I reluctantly spyder webbed the spring with JM Euro Tar. Eliminated all the vibration now. It makes 13ftlb. Any idea what spring I have? I might use something else maybe buy JM's current spring (fits the guide tightly) and make my own top hat/spacer. I'd rather not have a "grease gun". Thank you, if you can identify my current spring.

Looked like this when I got it. 4x Hakko RWS TV view scope came with it. Probably sell that soon.
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Looks like this now
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