Silistretcher /2 question

[BFL]

I have both versions of Silistretcher and have a question. Does the silisleev have to extend full penis length to get the most from the stretcher or is half length OK provided I have good grip?

 

[DLD]

I have both versions of Silistretcher and have a question. Does the silisleev have to extend full penis length to get the most from the stretcher or is half length OK provided I have good grip?

Half is just fine