The invention relates to a mounting post that can be selectively installed in a helicopter or other aircraft in order to support a tactical weapon or other equipment and removed when not required so as to free up additional passenger andor cargo space. A conical housing is releasably clamped to the base with spring clips in surrounding relation with the filter element to allow for efficient installation and removal of the filter element in the housing. The catheter may also be used to diagnose urinary retention problems caused by a weak bladder or a prostatic obstruction. Various prenylation inhibitors having the necessary structural groups to bond covalently, or essentially irreversibly, to the prenylation enzyme include carbonyl or thiocarbonyl compounds and alpha oxo-epoxides bonded to a hydrophobic, substrate-mimicking group. A medical apparatus includes such a patient support table, and in a method to adjust the patient support plate of the patient support table, appropriate interaction of a user with the touch-sensitive input device effects the adjustment of the support plate along the at least one axis.