My Gtech HT20 trimmer has given me more than one problem in its relatively short life. It now appears that one of the drive belts has broken, rendering the trimmer useless. Replacement belts are readily available (but not from Gtech) and people seem to have had no problem in fitting them. But, despite my skills with mechanical items (and all relevant tools), I cannot fully remove the casing on the head to access the belts! Gtech is useless when it comes to providing help with this, or similar problems. It does not 'advise' removal of the head cover and cannot or will not explain how to do so. It is of course willing to sell me a new head (quite unnecessary) for £60. Can anyone please explain how to remove the black casing from the head? I have it loose but I still cannot prise it away from the cast body.