This is an attempt to mimic some of the functionality of the tweak tool using bands. It doesn't take long to run and often produces a few points in the endgame but doesn't seem to be a big point getter.

Algorithm outline

For each helix
Bracket it with loops of the specified size
For each residue of the helix, create a band from the alpha carbon into empty space parallel to the backbone (more or less: not sure if I've understood the spherical coordinate system correctly)
Wiggle a region making up the helix plus spacers on other side.
Wiggle
Delete bands
Shake or mutate
Wiggle sidechains
Wiggle
Record any improvements as appropriate
end

Repeat in other direction (clockwise/anticlockwise)

Parameters

Loop spacer

Just as when using the Tweak tool you have to bracket a sheet or helix with loop segments; so you can do something similar here.

Band length

Adjust to taste but the default value seems to be reasonable.

Band strength

Ditto.

Helix list

All selected by default

Co-twist

If set to true, twists a helix together with the nearest selected helix. Seemed like a good idea at the time but not sure how useful it really is: I haven't seen gain from it.

Mutate not shake

For design puzzles only. If set will replace Shake after banded wiggle by Mutate as indicated in the algorithm outline above.

Clockwise

Whether a clockwise twist is done first or an anti-clockwise one. Kind of unnecessary.

Check conditions met

When set, will only accept a score improvement if all conditions are met. For puzzles where some restrictions are imposed.

Keep trying

Repeats everything indefinitely with minor random changes to band length and band strength.