Last June, I sold our gas-powered mower and bought a manual reel mower.  Our yard is small, and without a shed or garage I didn’t have any place to keep the gas mower, so it seemed like a great fit.  I ended up buying the 16″ Sunlawn LMM40.  The big sell to me was blades which rarely need sharpening.  After one season they’re still sharp, so I guess that’s good.
Last week when I mowed for (hopefully) the last time this year, I noticed the blades didn’t want to engage properly.  The mower has a 2 year warranty, so I tried to contact Sunlawn through their website.  Both e-mail addresses bounced and there is no phone number.  Fortunately I had purchased it through Reel Mowers USA, and they have agreed to send me the parts.
I definitely appreciate Reel Mowers USA honoring Sunlawn’s warranty, but based on the complete lack of contact methods, I would caution anyone out there from buying any of Sunlawn’s products.
Update:
It seems Sunlawn and Reel-Mowers-USA have both gone out of business.
I couldn’t find parts, but I managed to “fix” it.  Effectively this converts the “clutch” into a fixed gear.  Instead of spinning freely backwards (and forwards, when broken), this will lock the wheels to the blades.  I was worried it would make cutting awkward, but it works amazingly well.
If you’re a bit handy, here’s how:
- Set the mower on its side.
 
- Remove one wheels.  You’ll need to pop the plastic yellow caps off with a flat screwdrivers or knife, then remove the clips and the wheels.
 
- Slide off the hard plastic gear.
 
- Slide the small (1″x1″) metal plate out from the spline
 
I believe the problem is that the gear wears down slightly, and this metal clip no longer engages properly.  To “fix” it:
- Reinsert the metal plate at a slight angle
 
- Slide the hard plastic gear back on.  It should slide part way, but not completely, since you’ve (intentionally) misaligned the plate.  For good measure before I did this I cleaned the grease off the spline and applied a few drops of gorilla glue to the gear
 
- Tap the gear on with a hammer
 
Now the gear should be fixed to the spline.  Put it back together and repeat for the other side.
Good luck!