Thanks for the replies. Service kit seems like a good idea maybe. How do I know if they need the servicing? They work, so I guess sourcing the bolts is cheaper option.
 
Its also worth searching other US sellers as the post can be very reasonable. That $30 is probably express air-mail but for small items I've had stuff posted form the US for the same as UK domestic post. I've seen the overhaul kits in the UK somewhere and that my be tour best bet. Do you have a part number?
 

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