Just head on down to your local hobby shop and or the ACE Hardware and get longer 4/40 bolts. The Ace Hardware sells them in the bulk screws department. While there you will need to pick up some 4/40 nuts and lock washers. You can also use a 4/40 nylock nut which has a nylon tip on it so that it will not vibrate loose. You will need to make sure that the new bolt sticks out the bottom of the engine mount at least 1/4 inch to accept the nut and washer. My Ace Hardware has the 4/40 bolts in slotted head as well as hex head which requires using an allen wrench to tighten them up. You might find that the hex head bolts are a little easier to tighten up. My local Hobby shop also sells packages of 4 screws and nuts for about a $1.00. Good Luck, Dave