While researching for the bolts to secure the Hegner to the brackets for the Miter saw stand, I ran across a short note in the Hegner Manual that discussed the size of blade to the blade holders.
There are three sizes of blade holders for the Hegner; .5mm (blades, #4 and smaller), .7mm ( #4 though #9 ) and 1.0mm ( larger than #9 ). Using too large a holder may result in premature failure at the clamp.
.7 mm is the standard size that ships with the Hegner. I use mostly smaller than #4 blades and I had been having issues lately braking more blades than normal. I have ordered new blade holders; two sets of .5mm and one set of 1.0mm. I'll update after I've had a chance to try them out.