One of the nicest things going in Helsinki Skatescene right now (theres about 1 meter of now outside so not right now, but you know what i mean) is the DIY concrete park at Suvilahti Harbour area. Kingpin has made some videos of diy parks around Europe and heres the Helsinki version.
This got a bit out of hand but heres a tip for you if you just fucked the screws out from your oilblug and the bike happens to be a dyna or anykind of harley and you you cant find a big enough of a bolt and you only have a 14mm v-coil with a 1,25 screw (thats the one they put in lot of the sparkblugs). So first put the sparkblug in the lathe and turn the screw bit of the blug out
Then find a bolt you wanna use as a base and turn it so that it fits inside sparkblugs screw.
After that you just weld them together and cut it if its too long.