PROBLEM TO BE SOLVED: To reduce the temperature effect generated by molding heat, avoid the deterioration and defective rotation of a rotatable inner dowel generated by the high temperature, simplify the structure of the rotatable inner dowel and carry out simply the replacement work and the manufacturing work at a molding site. ;SOLUTION: A cylindrical body with a large inner diameter section 15 and a small inner diameter section 14 is provided with a fitting fixed outer ring section 2 with a dial 3 formed on the end face on the side on which the small inner diameter section 14 is opened, a cushion ring 17 as an annular body having the inner diameter almost equal to the small diameter section 14 and the outer diameter to be fitted on the large inner diameter section 15 and also having at least one opening 18 in which a steel ball 10 is embedded through a spring 9, and a rotatable inner dowel 5 having the constitution in which a columnar base 11 to be fitted on the large inner diameter section 15 and a shaft section 13 protruded from one end face of the base are provided and position determining holes 12 are annularly formed and disposed on the end face of the base 11 and an arrow mark panel 6 is formed on the end face of the shaft section 13.;COPYRIGHT: (C)1998,JPO
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