Hi Chris. Yes you're correct the brushes have been the cause of most of the problems. For the majority of motors operation has been fine until either heavy loading or impacts which have bought the brush quality issues to light. In most cases the brushes have been visibly fine from a contact and angle perspective but have not handled high operational stresses at all well. Here's a side-by-side view of a set of the 24V brushes by the brushes of a 12V HRS550, spotting the quality differences is not exactly trivial except for those motors which have had a poor contact angle to start with (which may actually include yours by the sounds of it).


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​Please do email me if you'd like to claim your 18V motor replacements or to send back the 24V motors for a refund as discussed in the previous post. Most previous customers of the 24V motor have now done this.