I bought a singlespeed Whippet second-hand last year and I love it, but I've been having problems keeping the rear wheel in place.
It's got horizontal dropouts and a QR with a chain tug which eventually bends or snaps when the wheel works loose.
LBS suggests either (1) vertical dropouts and a chain tensioner, or (2) building a new wheel on a Surly bolt-on SS-specific hub.
With (1) I feel I might as well have a derailleur
With (2) it looks a bit freeridey, i.e. heavy (bearing in mind this bike is for XC racing)
What do/would you do?