I have had some enquires about our knee bumps, here is my template on 1cm squared graph paper. The bumps are made from six layers of good quality roll mat (genuine Karrimat that comes in yellow and white, luckily for us) laminated with Evostik.
The result is about 5cm thick, they are stuck on with Evostik, together with a square piece for that extra knee comfort paddling with bare legs in summer.
