central axle 17 having a pair of exposed ends 18 each exposed end 18 has a bearing 20 mounted thereupon to allow each exposed end 18 to be mounted and enable low frictional rotation of central axle 17 cylindrical surface 16 may be rubber coated as shown frame 12 includes a main body 21 and a pair of fork structures 22 mounted on opposing ends of main body 21 frame 12 may be mounted by means of a pair of holes 24 which may be threaded each fork structure 22 includes a pair of members 26 which extend away from the main body 21 like tines on a fork member 26 includes a distal end 28 which is adapted in cooperation with the distal end of fellow fork member 26 to constrain a bearing 20 from moving away from frame 12 and main body 21 the distal ends 28 of each respective fork structure 22 may even be connected however the lack of connection provides a lower profile for clearing print media handled by platen roller 14 each bearing 20 is biased away from frame 12 and main body 21 by a cylindrical bias mechanism 30 to allow good conformance for example to a mating print head the present bias mechanisms 30 each includes an adjustment screw section 32 a spring bias mechanism 34 and a bearing retainer 36 the inwardly facing sides 29 of fork members.