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[pupjoint]

   Right    just went into shed to tinker with my Ranzow build and I've broken one of the propellers  and now have to order replacements 
How do I know/workout which thread to buy i.e. M3,M4,M5 etc. I've got this gut feeling that it's M4 but can't find anywhere in the instructions that confirms this, so don't know where I got this from. So how do I tell? 
  I knew I hould have stayed indoors 

[boatmadman]

Measure the diameter across the threads, that will give you the thread size if its a metric thread, eg, 4mm dia = m4 etc.

For absolute certainty, get an m4, m5 m6 etc nut from B&Q and see which one fits and Bob's yer Auntie

Ian

[pupjoint]

Superb  Cheers Ian