For those who have experience with the Deluxe On-Road model (apologize this is the off-road forum), does the bulb actually touch the top of an engine? How far does the unit fit over the heat sink of an engine (for example a Nova PT 1/8 on road)? Does it fit beyond the heat sink and onto the crack case? Does you have to apply pressure to put it on an engine or is it a drop fit?

I just received mine (not yet open the package) and don't want to squash the bulb.

Many thanks.