Thank you, John.
According to the US MFG's representive, the models now offered over here have a TWECO "type" gun, but if the trigger pull is as hard as your's is I will most likely buy another, or utilize my 17 yr old son's youthful strength! hah-hah. Thanks for your input, I'm hoping that for use at the track that the welder will fit our needs, as from all I've been able to ascertain, it's feautres match or exceed the MIller and Lincoln models in the same power range and is easily $200 (US) less expensive. Since you have a Clarke unit, do you use gas shielding? Also with or without gas, have you found your welding with this unit to be satisfactory? Thank you again, John.