if anything breaks, you can buy Rubbolite parts for models 312 and 313. I got a set for replacement parts and they seem to be exactly what LR used. You can find them online. There is also a LED version :
360.312LED0106 led model 312 £94.38
360.313LED0106 Led model 313 £118.57
If anyone is interested: I got these prices from Danny Miles <email@example.com> which I contacted by email following a search on the web.