I surmise the 'slightly more than' 5/16 is 'slightly less than' 3/8 and the about 1/8 is slightly less than 1/8.chapmanruss wrote:I should mention, which I neglected before, that my wheels lift about 1/8" off the floor when in the resting position. I said my legs lift about 1/8" and 5/16" since I didn't get exact measurements. The wheels, at rest, lift slightly more than the first step of about 1/8" and the higher step is slightly more than 5/16". I could get more exact measurements but since these heights work for me I'll wait until I get curious enough to check. As far as the question of how much to change the height of the new holes, mine would be about an 1/8 of an inch.
All this attention to 'wheel lift' is misleading. The casters are a sloppy vertical fit in the pistons which are moved by the cams.
Since the wheels are 'about' 1/8 off the floor, the pistons must move 'about' 1/8 to contact the floor.
Then the vertical slop must be 'absorbed'.(piston move with no identical wheel vertical motion)
Then the 'lifting' begins and the remaining vertical cam/piston motion results in lifting the legs off the floor.
1/4" cam = 1/8 wheel drop + slop + slightly less than 1/8".
Now any variation in piston bore depth/overall length and caster stem length in addition to sloppy hole placement will also affect the final result!