OK Dave h0ugh, here is your bracket (shortly to be in the mail) and fitting instructions.
The bracket isn't entirely flex free, but I'd say its as solid as the stock brackets and so should be OK.
1. Remove existing sharpsky bracket from focus motor, note that there are 4 washers underneath the bracket, take it off somewhere safe in case the washers try to run away and hide (as mine did)...
2. Fit the new bracket to the motor, re-use the washers between the motor and bracket. Leave the screws loose until after the bracket is fastened to the focusser. Note the screws have a very fine thread and are easily cross threaded or stripped so be careful. @ Dave T, it wouldn't hurt to use slightly bigger screws, I can't see the threads lasting if motors are transferred between mounts in this manner.
3. Remove the fine focus wheel, if you have some of the "
Steampunk" tubing (© Fred) to shim the shaft now is the time to use it.
4. Take out the two countersunk screws holding the bearing assemblyon the focuser, make sure there is some pressure on the focusser so that the assembly doesn't move.
5. Slide the focus motor on to the shaft, allowing a little clearance between the coupler and the coarse focus wheel. Using the 2 dome headed screws secure the bracket which should be close to perfectly aligned, if not you may need to make some small bendy type adjustments. After the two bolts are tightened on the focusser, you can then carefully tighten the screws on the motor, not too much pressure as mentioned before. Once you're satisfied with the alignment tighten the coupler screws, there is one black allen bolt and 2 grubscrews).