Hello everyone!
My tip: The Federnzentrale in Munich.
(Exaggeratedly) From the Swiss watch mechanism (spiral!) spring to everything you could possibly need, including a buffalo.
The only drawback, often, if you want to save money on a custom-made item: the delivery length is not less than 1 meter

.
Source:
http://www.federnzentrale.de/
Best regards from Munich!
1. S.verlängerung: Audi A4 Avant quattro, 1,9 TDi MKB: AFN, BJ98, Vollausstattung, +VP1L
2. Moped BMW K1200RS, 130 PS, BJ98, Vollausst.
3. T5 1,9 TDI PD (AXC), BJ04 - nur Ärger!