Some of the pics in link are of electric ones. http://www.google.co.uk/search?q=el...drAMszXPcS5gfgM&ved=0CDMQsAQ&biw=1024&bih=614
Looks like builders use them for brick faces (before rendering?)
I sometimes use the Clerke one third pic along top row but not the biggest of compressor driving it so not used to often.
Always wondered if one of those breaker drills (the type that can be switched to chisel action with no rotate) could be adapted/converted. Might be a bit heavy.
needle guns can be cheap and cheerful or they can be good, Try www.trelawnydirect.com
Trelawny are British made tools pretty sure there will be others though
I'd be interested in one depending on price...just had to cough up for a new mattress this month as the cheap memory foam one of a 'bargain' the gf bought is woeful...sob story over