Hi, I been getting a slight knocking noise when taking off, so decided to check the dogbone engine mount (rear engine mount). Noticed that that the middle bolt, which goes into the gear box kept turning when I was trying to tighten the bolt. When my clutch was done my old mechanic must have cross threaded the coils inside the gearbox. The bolt threads look ok, but the coil inside the gearbox looks threaded. I spoke to my friends dad who is also VW mechanic, he suggested that I might need a hollo-coil to insert into the hole in the gearbox, so the dogbone mount bolt will grip and tighten. I was wonder if anyone knows where I could get this hollo-coil from and if anyone else has had a similar issue. Any suggestion would be helpful on how I can fix this.