crwdns2935425:04crwdne2935425:0
crwdns2931653:04crwdne2931653:0
The size of the blocks
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The empty space between the upper and lower block should be a little superior to the size of the shelf where your lamp is to be placed. In my case 40mm.
crwdns2944171:0crwdnd2944171:0crwdnd2944171:0crwdnd2944171:0crwdne2944171:0