home made wine

Question

Shalom, Last summer I bought some grapes and made some wine. The first step in the process is to de-stem the grapes and lightly crush the fruit. I did this with the use of a machine at a local brew shop. Someone suggested to me that the wine may not be kosher since a goy "turned on" the machine. The machine was clean of all grapes and stems (from other people {not Jewish} using the same machine) and only I touched the grapes/juice/wine from the time they were put into the machine until I bottled it a few months later. I would like to make wine again this fall and I would appreciate your thought on my existing wine and any suggestions for the future. Thank you and Tizqu LeShanim Rabot. Sam