General Machine Products 70046 Strand Tensionmeter - Manual (Page 18)

18
Certain Strand Tensionmeters manufactured and
sold between Jan. 1991 and July 1992 had cam
plungers of a different design than either the
AT&T units which preceded them or the current
GMP design which follows them. These units bear
serial numbers in the range 1700-2300 stamped on
the handle. When checking the tension on 1/4”,
5/16” or 3/8” diameter strand, a part called the ac-
cessory saddle block must be used to achieve dial
indicator movement and a correct tension reading.
This accessory saddle block is a rectangular steel
block which mounts on top of the cam plunger and
is held in place by two 7/16" head hex screws. The
calibration charts furnished with these units have
an asterisk (*) alongside the handle position num-
bers for the strand sizes where the accessory sad-
dle must be used. A handle position number with
no asterisk means that the accessory saddle must
not be used. The accessory saddle applies only to
the units described above and does not apply to
AT&T units, nor does it apply to GMP units with
5 digit serial numbers. Accessory
Saddle