Tuning Where to get performance enhancement?

Need just a little more than "old rws break barrel". Like 40+ years old and original seals & such or ... . Also when ARS was the importer RWS could be found on almost every airgun manufacturer, logan,theoben,... . 

Likely you can do any needed repair unless you've really got an odd OLD one.

Could be all the parts you need here: 

https://www.airrifleheadquarters.com/page/page/251327.htm

John