da Rock

jaka,
You don't actually need to use two clunks if you use flexible enough hose inside the tank. Matter of fact, using separate clunks can cause problems. Just make sure that the hose is flexible enough that two of them going to the same clunk isn't so rigid that the clunk won't fall around the tank back.

If you stick a short section of rigid tubing into the end of the pressure hose that's in the tank, it provides you an excellent "device" that is easily strapped to the clunk. I usually have that rigid tubing stick out of the pressure hose enough that only the rigid tube overlaps the clunk. Then it's easy to either wire it on the clunk or use wire-bundling-strap (the plastic things we use for so many different jobs). Or if you're still using brass inside your tanks (not the best idea) and your clunk is brass and the rigid tubing is brass, you could solder them together, another neat installation.

The idea behind the uniflow is to lock the pressure outlet into an unvarying distance from the fuel pickup point. Obviously, two clunks should follow the same general paths, but just using one heavy clunk and two adequately flexible hoses works great and gives you the opportunity to lock the pickup and pressure outlet together.

And btw, in the old days, the CL stunt guys didn't use clunks. Almost none of us used anything other than tin tanks with brass tubing and it was all soldered into place. Rigid setups for sure. And... chuckle... most of us would recoil in horror at the thought of putting TWO lumps of weight into our planes when one lump was enough. And we'd probably trim that lump of clunk some to reduce it's weight... lol at us..... We didn't even like to put too much solder into the tanks when converting them.