You dont need the bent wrenches. I just did the VA on my 240D with 1 14mm wrench and a pair of channel locks.

When the valve is tight - hold the hex cover on top of the spring (just under the two nuts) so it doesnt turn. Then - turn the bottom nut counter clockwise. Both nuts will move together as 1 unit.

When the valve is loose - same procedure but turn the top nut clockwise.

There are a couple valves that its really hard to get the channel locks to - but you can figure it out with a little patience.