[quote]ORIGINAL: chemie
ORIGINAL: wesaysoracing
i have found on the plastic mounts to drill the pilot hole and then chuck up a socket heat bolt in a electric drill ,lube the threads of the bolt and let the drill turn the bolts into the mount, instead of cutting threads they are more like rolled threads
that works well for plastic mounts as long as you reverse the bolt after drilling it in, drilling the nylon heats the plastic and can really stick the bolt into the mount when the plastic cools.
on all my mounts I tap the threads, and after mounting the engine using longer bolts, I nut the ends, it helps reduce vibration and helps keep the bolts from working there selves loose, having mostly cowled planes I don't have to check the bolts all the time.
the photo also shows the remote glow wire attached to the mounting bolt, I also have used the longer bolts to attach lead balast to the engine mount for balancing the model using a second nut to secure the weight as far forward as possable without securing exessive weight to a cowl.