Greetings Engine Experts!

I recently procured an older Leo 25 off of ebay for 28 Euros (37 bucks).

After a brief clean-up, I got the engine started using a 9x4 prop and the glow plug it came with... an OS A5.

I've looked on the internet for info about this engine - even the Leo site (http://www.leoengines.com) doesn't indicate the recommended glow plug or props.

The OS A5 plug started the engine a couple times but then I had a bit of a problem with it so I swapped it out with an Enya no.3. Seems to run fine.

Question: Any idea what would be the best glow plug/prop for this engine?

Thanks in advance,
Zipperneck (neub)