VW 1302 Super Beetle rear axle

In order to prevent loosening of rear axle trailing arm pivot bolt, thee iron nail pins were hit down on the portion on both side promptly. Checking the loosening phenomena because of added rubber sheets in addition to the original viscoelasticity of the bushes, no inconvenient loosening was observed in contrast with the check marks. Though it is said for ordinary automobiles, some dense verification and periodic inspection are required especially for an old car like my 45 years old Super Beetle. No making little of it, cutting corners nand shoddy inspection are allowed.