I have lost the spacer to the chain guide (between the frame and chain guide). I can see in jff-biking's picture from site 1 that there is 1 spacer there. In the manual, site 11, there is 2 spacers - 2x 0,5 mm. Is there 1 spacer that is 1 mm thick instead? Do I need 2 spacers? Does it matter for...