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I use my 172 for Targa Rallies but am having trouble with the 2nd gear syncro spring in JC5 128/9 gearbox, it keeps breaking.
Is there any way of strengening it or stopping it breaking?
Only way to stop that happening is to replace 1st and 2nd gear with the updated kit @ around £250. Replaces the gears, synchros and selector hub. Also does away with that spring.