Because winters are long and dark here and I had plenty of free time, I bought a micrometer, valve shim kit with smallest possible steps (prox) and best available feeler gauge with smalles possible steps and tried my hand with the valve check, maybe at a little early, maybe it was 12000 kms... Found out that clearances were on the tight side on some valves and decided to go to the large end of clearances... After doing the first head a couple of times (a slow learner) the three remaining heads went nice and smooth (I had then two sdr 1290 bikes, a 2014 and 2015 ones) and afterwards, when the bikes were at the 30 000 kms, I redid the measures. And changes were minimal, largest differences were only about a half of a hundreth of a millimeter differing from the earlier measurements (yes, can be natural variation but I did a lot of measuring with micrometer at my work then). The small black plastic breather thing at the rear cylinder was only a little bitch to keep in place at assembly... I had earlier some experience with cars but never done shimmed valve gear checks earlier. I remember a few screw and bolt type valve gears on old cars done earlier... Also, I thought to ease it a little by removing the radiators, change the coolants at the same time. Radiators were a pain to be cleaned, all kind of stuff between the fins, tried all possible cleaner chemicals, pressure washer, hot and cool air etc. but a wooden coctail stick was maybe the best tool in that work...
Regarding the time spent doing the valve check and adjustment work I never believe a professional service provider can complete that task really well and have a profit of it - so I have decided to help them with their burden. And when you do it yourself you really know what is really done a what is not...