Drill out aft 1/4"mounting hole on mounting tubes. Using mounting plate as template, drill out forward 1/4" holes.
Assemble HP-79 engine mounting brackets as shown in Detail A of dwg using rubber Barry mounts, HH-16 AN4 bolts, washers and spacers and locknuts.
Insert cylindrical aluminum spacers between enging block and mounting plate and hand tighten into place with stainlless steel 10mm x 1.25mm bolts (4). Mount engine spacer blocks HKS-1 into place between mounting plate and brackets and hand tighten into place. Temporarily attach propellor to engine reduction gear and check blade clearance against boom. All OK.
Email CGS and HPower re use of rubber isolating snubbers between mounting plate and brackets.
