The clutch on my venerable Makita went buggerup, not unexpected so I hied me down to ITS, there to buy a replacement. I looked at the Bosch, but the build quality was shockingly bad and have ended up with another Makita.
Anyhow, I thought I might have a fettle of the old gearbox, nothing ventured and all. Well, the (three speed) gearbox disassembled a little more speedily than intended, leaving an interesting Jigsaw puzzle. Satisfyingly, I got it all back together and working, although the wear justifies its replacement.