PCT No. PCT/SE91/00847 Sec. 371 Date Jul. 15, 1993 Sec. 102(e) Date Jul. 15, 1993 PCT Filed Dec. 9, 1991 PCT Pub. No. WO92/10340 PCT Pub. Date Jun. 25, 1992.A mounting base for chain saw guidebars, comprising a plate (11) with a slot (14) in which a guide piece (36) can slide in the lengthwise direction of the guidebar, said guide piece being acted on by one or more pistons (17) energized by a self-contained pressure source (19) preferably comprising a gas spring, and a valve device (18) which can be set in different positions, during sawing urging the guidebar outwards with a predetermined force and preventing displacement inwards, and during changing of saw chain or guidebar permitting displacement inwards of the guidebar while preventing the pistons (17) from urging the guidebar outwards.
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