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I've ridden since 1967, and had to fix flats on the roadside on pretty much everything I've owned.  I've never had a bike without a center stand and I'm planning to fit chambers to my RD350.
Spoked rims with tubes obviously can't just be plugged and limped home, so, three questions:

1. Anyone make chambers compatible with the center stand?

2. Any practical suggestions on how to do the roadside repair without one?

3. Any chance of Slime working in a tube?

Thanks!

Economy Cycle is close, and my preferred supplier.  I'm rebuilding my '74 RD350, it'll be mostly stock but with YZ125 reeds, mild porting, the Economy Y-boot filter kit, and crossover manifold without boost bottle.  I'm undecided on chambers. 

Likely will need barrels bored, so, do I want ProX, Vertex or Wiseco pistons for this build, and why?