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@M_V
Big washer would do the trick but finding a suitable one isn't always as easy as it sounds.
You need a good tolerance around the axle (more on this later), a fair bit of thickness so it doesn't just deform along with the frame and a large enough o.d. that it'll do the job you want it to do.
Instead of searching for a washer that fits the bill, I buy chaintugs like these,
And modify them slightly.
The silver threaded shaft is just screwed into the round bit that goes on the axle and held in with a bit of locktite. Lock 2 nuts together on the shaft and you can unscrew it. You're now left with a thick alloy washer that doesn't weigh a ton, is a snug fit on the axle and has a good o.d.
(There's usually about 5-10mm of thread in the round black bit so with the correct size bolt you can get the chain tug function, save yourself from having to carry around an 8 or 10mm spanner and you wont have loads of that shaft sticking out the back of your track ends)
I like that the 'washer' locates into the slot in the dropout (it doesn't serve much purpose but, you know...) and they are usually a nice tight tolerance fit on the axle so won't flap about on the axle and find their way down next to the locknuts inside the frame when you remove/refit your wheel.