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The 4.3mm holes in the ring were then all tapped M5 x 15mm deep from the inside.
I used an angle drill to countersink all the 5mm holes around the 'bell-housing'.
And so, to the adapter plate. The gearbox that came with the engine offered the ideal template- maker for our adapter. I cut a piece of 1mm aluminium sheet and made a perfectly-sized hole for the mainshaft using a tapered reamer.
Then, thoroughly keyed and cleaned, I bonded the ring to the 'bell-housing' with Helicopter Blade Glue - a two-part epoxy about as strong as you can get. and screwed it with stainless M5 countersunk screws and engineering Loctite.
To order Tel: 01580 891309 or 07964 336183 or Fax: 01580 893733 or online at www.cbsonline.co.uk