{TAIL ~ The rollers} 27 are of {HEAD ~ conventional design} comprised of a ball 63 mounted in a base 65 which includes a mounting flange 67 through which cap screws 61 are journeyed to be secured in the respective channel member 
{ TAIL ~ The rollers } 27 are of { HEAD ~ conventional design } comprised of a ball 63 mounted in a base 65 which includes a mounting flange 67 through which cap screws 61 are journeyed to be secured in the respective channel member
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