We had a customer who rang us in desperation. He had a Sky Vac and had been trying to finish a Housing Association in London for two days but could not get the weeds out with suction only. No ladders were allowed on site and there was no access for lifters. He actually cut a piece of his pole off and sent it to us for sizing (that is when we discovered their poles were part fibre glass).
We made a head and tools to fit, he e-mailed us with thanks because he was able to finish the contract within two hours.
We have developed a tool which we are finding to be a game changer, it combines suction with lifting. We used it Friday on a weed which would not budge, twenty seconds later it was out, but it needs a rigid frame for it to work, not a piece of radiator hose!!