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[RAAArtyGunner]

JP,

You are aware that Martin has a Mayhem facebook page also.

So no reason you can't post on it for the Facebook fanatics.

[Martin (Admin)]

Mayhem on The Facebook:  https://www.facebook.com/groups/ModelBoatMayhem/

[FerryNostalgic]

Thanks for pointing that out. Although I had joined a few months ago, I'd forgotten all about it!
JP

[Onetenor]

I have just had a similar problem and my solution for a slightly loose connection on a motor shaft is a bit unconventional!  I increase the diameter of the shaft with solder.
This needs to be done quickly!
I put solder flux on the shaft and lightly tinned it with some solder and a hot iron.  A cold tissue with cold water quickly cooled it down.
Then using a file I put some volts on the motor and let the file take the surface almost down towards the original shaft diameter.  A good solder joint leaves an even amount of solder on the shaft.  This puts a few thou on the diameter and can be adjusted to fit the coupling.
Perhaps a little unconventional but it has worked several times for me.
I use some commercial motors and they often have 'difficult' shaft diameters.
If there is a bigger discrepancy then a small length of brass tube might solve the problem. as long as there is a good fit the grub screw will secure the coupling.
regards Roy

A quick way to tin the shaft is melt some solder in a pot of some sort. Abrade and flux the shaft then dip it in the solder then cold water. It is so quick the motor has no time to get hot.  Then file as before
BTW What do you mean by "Commercial" motors ?